build

GitFetch API: Refactor `jj git clone` to use new GitFetch api directly. #16759

Job	Run time
Build jj-lib without Git support	45s
Check protos	33s
cargo-deny (advisories)	25s
build (ubuntu-latest)	1m 40s
cargo-deny (bans licenses sources)	24s
build (macos-13)	3m 0s
Clippy check	2m 24s
build (macos-14)	2m 3s
Check that MkDocs can build the docs	10s
build (windows-latest)	5m 32s
Check that MkDocs can build the docs with latest Python and uv	13s
Check formatting	18s
build (ubuntu-latest, --all-features)	2m 32s
	19m 59s

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