build

git: get_git_repo -> get_git_backend_repo, distinguish it from curren… #15199

Job	Run time
Build jj-lib without Git support	45s
Check protos	31s
cargo-deny (advisories)	23s
build (ubuntu-latest)	4m 41s
Clippy check	2m 36s
cargo-deny (bans licenses sources)	23s
Check that MkDocs can build the docs	27s
build (macos-13)	6m 11s
build (macos-14)	3m 30s
Check that MkDocs can build the docs with Poetry 1.8	23s
Check formatting	17s
build (windows-latest)	10m 38s
build (ubuntu-latest, --all-features)	5m 35s
	36m 20s

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