build

git: add `git.colocate` to colocate repos by default #12339

Job	Run time
Build jj-lib without Git support	49s
build (ubuntu-latest)	4m 8s
cargo-deny (advisories)	27s
Check protos	23s
build (macos-14)	3m 33s
cargo-deny (bans licenses sources)	23s
Clippy check	2m 35s
build (windows-latest)	7m 28s
Check that MkDocs can build the docs	22s
Check that MkDocs can build the docs with Poetry 1.8	23s
build (ubuntu-latest, --all-features)	5m 0s
Check formatting	17s
	25m 48s

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