Fix Windows tests (backport #10186)

[mergify]

• fixes the local+noindex uri in withRepo which enables many tests on Windows (just a matter of \\ -> /)
• normalizes some more output on Windows (\\ -> / but also removing C:\\)
• provide skip*IO functions on IO () to quickly discard tests without having to setup a test env
• un-skip and fix a bunch of tests here and there

55 tests in total which were skipped or expected broken on Windows now are passing:

➜ diff \
    <(rg -v "SKIP no cabal-install \(" code/cabal/out.txt | rg "(known|SKIP)" | awk '{print $1}' | sort -u) \
    <(rg -v "SKIP no cabal-install \(" master.out | rg "SKIP" | awk '{print $1}' | sort -u) \
    | rg "^>" | wc -l
55

and 66-55=11 tests were previously being skipped and now are marked as known failure, with an issue number:

➜ diff \
    <(rg -v "SKIP no cabal-install \(" code/cabal/out.txt | rg "SKIP" | awk '{print $1}' | sort -u) \
    <(rg -v "SKIP no cabal-install \(" master.out | rg "SKIP" | awk '{print $1}' | sort -u) \
    | rg "^>" | wc -l
66
```<hr>This is an automatic backport of pull request #10186 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of f33929b has failed:

On branch mergify/bp/3.12/pr-10186
Your branch is ahead of 'origin/3.12' by 3 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit f33929bdd.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   cabal-testsuite/src/Test/Cabal/Monad.hs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   cabal-testsuite/src/Test/Cabal/OutputNormalizer.hs

Cherry-pick of e290366 has failed:

On branch mergify/bp/3.12/pr-10186
Your branch is ahead of 'origin/3.12' by 4 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit e2903667c.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   cabal-testsuite/src/Test/Cabal/Prelude.hs

no changes added to commit (use "git add" and/or "git commit -a")

Cherry-pick of 4b1d9b9 has failed:

On branch mergify/bp/3.12/pr-10186
Your branch is ahead of 'origin/3.12' by 7 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 4b1d9b904.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   cabal-testsuite/PackageTests/AutoconfBadPaths/cabal.test.hs
	renamed:    cabal-testsuite/PackageTests/Backpack/Includes2/Includes2.cabal -> cabal-testsuite/PackageTests/Backpack/Includes2/I.cabal
	renamed:    cabal-testsuite/PackageTests/Backpack/Includes2/Includes2-fail/Includes2.cabal -> cabal-testsuite/PackageTests/Backpack/Includes2/I.cabal.fail
	renamed:    cabal-testsuite/PackageTests/Backpack/Includes2/Includes2.cabal.fail -> cabal-testsuite/PackageTests/Backpack/Includes2/Includes2-fail/I.cabal
	renamed:    cabal-testsuite/PackageTests/Backpack/Includes2/Includes2/Includes2.cabal -> cabal-testsuite/PackageTests/Backpack/Includes2/Includes2/I.cabal
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/cabal-external.test.hs
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/cabal-internal-target.out
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/cabal-internal.out
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/cabal-internal.test.hs
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/cov.out
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/cov.test.hs
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/setup-internal.cabal.out
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/setup-internal.out
	modified:   cabal-testsuite/PackageTests/Backpack/Includes2/setup-per-component.test.hs
	renamed:    cabal-testsuite/PackageTests/Backpack/Includes3/Includes3.cabal -> cabal-testsuite/PackageTests/Backpack/Includes3/I.cabal
	modified:   cabal-testsuite/PackageTests/Backpack/Includes3/cabal-external.test.hs
	modified:   cabal-testsuite/PackageTests/Backpack/Includes3/cabal-internal.out
	modified:   cabal-testsuite/PackageTests/Backpack/Includes3/cabal-internal.test.hs
	modified:   cabal-testsuite/PackageTests/Backpack/Includes3/cabal-repo.test.hs
	modified:   cabal-testsuite/PackageTests/Backpack/Includes3/setup-internal.cabal.out
	modified:   cabal-testsuite/PackageTests/Backpack/Includes3/setup-internal.out
	modified:   cabal-testsuite/PackageTests/Backpack/T6385/cabal.test.hs
	renamed:    cabal-testsuite/PackageTests/Backpack/bkpcabal01/bkpcabal01.cabal -> cabal-testsuite/PackageTests/Backpack/bkpcabal01/b.cabal
	modified:   cabal-testsuite/PackageTests/Backpack/bkpcabal01/cabal.out
	modified:   cabal-testsuite/PackageTests/Backpack/bkpcabal01/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/BuildTools/Foreign/A.hs
	new file:   cabal-testsuite/PackageTests/BuildTools/Foreign/my-foreign-preprocessor.bat
	new file:   cabal-testsuite/PackageTests/BuildTools/Foreign/my-foreign-preprocessor.ps1
	modified:   cabal-testsuite/PackageTests/BuildTools/Foreign/setup.test.hs
	modified:   cabal-testsuite/PackageTests/CCompilerOverride/setup.test.hs
	modified:   cabal-testsuite/PackageTests/Check/ConfiguredPackage/Paths/InvalidWin/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/CmmSourcesDyn/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/ConditionalAndImport/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/CustomSegfault/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/ExtraProgPath/setup.test.hs
	modified:   cabal-testsuite/PackageTests/ForeignLibs/setup.test.hs
	modified:   cabal-testsuite/PackageTests/GHCJS/BuildRunner/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/GhcPkgGuess/SameDirectory/setup.test.hs
	modified:   cabal-testsuite/PackageTests/GhcPkgGuess/SameDirectoryGhcVersion/setup.test.hs
	modified:   cabal-testsuite/PackageTests/GhcPkgGuess/SameDirectoryVersion/setup.test.hs
	modified:   cabal-testsuite/PackageTests/GhcPkgGuess/Symlink/setup.test.hs
	modified:   cabal-testsuite/PackageTests/GhcPkgGuess/SymlinkGhcVersion/setup.test.hs
	modified:   cabal-testsuite/PackageTests/GhcPkgGuess/SymlinkVersion/setup.test.hs
	modified:   cabal-testsuite/PackageTests/InternalLibraries/Executable/setup-static.test.hs
	modified:   cabal-testsuite/PackageTests/InternalLibraries/setup-gen-script.test.hs
	modified:   cabal-testsuite/PackageTests/JS/JsSources/js-arch.test.hs
	modified:   cabal-testsuite/PackageTests/JS/JsSources/other-arch.test.hs
	modified:   cabal-testsuite/PackageTests/JS/JsSourcesExe/js-arch.test.hs
	modified:   cabal-testsuite/PackageTests/JS/JsSourcesExe/other-arch.test.hs
	modified:   cabal-testsuite/PackageTests/LinkerOptions/NonignoredConfigs/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/LinkerOptions/T7339/setup.test.hs
	modified:   cabal-testsuite/PackageTests/MultiRepl/EnabledSucc/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/NewBuild/CmdRun/Terminate/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/NewBuild/CustomSetup/RemotePackageWithCustomSetup/build-package-from-repo-with-custom-setup.test.hs
	modified:   cabal-testsuite/PackageTests/NewBuild/T3827/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/OfflineFlag/offlineFlag.test.hs
	modified:   cabal-testsuite/PackageTests/PathsModule/Executable-Relocatable/setup.test.hs
	modified:   cabal-testsuite/PackageTests/PkgConfigParse/setup.test.hs
	modified:   cabal-testsuite/PackageTests/PreProcess/Hsc2HsOptionsCC/my.cabal
	modified:   cabal-testsuite/PackageTests/PreProcess/Hsc2HsOptionsCC/setup.test.hs
	modified:   cabal-testsuite/PackageTests/QuasiQuotes/dynamic/setup.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T4025/setup.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T4270/setup.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T4291/setup.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T5309/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T5677/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/Regression/T6906/cabal.test.hs
	modified:   cabal-testsuite/PackageTests/TestSuiteTests/ExeV10/cabal-with-hpc.multitest.hs
	modified:   cabal-testsuite/PackageTests/WarnEarlyOverwrite/clean-install-by-copy.test.hs
	modified:   cabal-testsuite/PackageTests/WarnEarlyOverwrite/clean-install-by-symlink.test.hs
	modified:   cabal-testsuite/PackageTests/WarnEarlyOverwrite/dirty-install.test.hs
	modified:   cabal-testsuite/PackageTests/postCheckoutCommand/cabal.test.hs

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   cabal-testsuite/PackageTests/Backpack/Includes2/setup-per-component.out
	deleted by us:   cabal-testsuite/PackageTests/HaddockKeepsTmps/cabal.test.hs
	deleted by us:   cabal-testsuite/PackageTests/NewFreeze/T9799b/src/None.hs
	deleted by us:   cabal-testsuite/PackageTests/ProfShared/setup.test.hs
	both modified:   validate.sh

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[geekosaur]

Depends on #9900 which isn't being backported.

[geekosaur]

@jasagredo, do you think there's a way to fix these for 3.12 without causing problems when 3.14 comes out? (Not that I think that should happen, since it will only involve master, not 3.12 branch.) Your original PR uses things from #9718.