build

cli: Refactor out `get_fetch_remotes` into git_util.rs #16576

Job	Run time
Build jj-lib without Git support	46s
cargo-deny (advisories)	24s
Check protos	42s
build (ubuntu-latest)	1m 45s
cargo-deny (bans licenses sources)	22s
Clippy check	2m 17s
build (macos-13)	2m 37s
Check that MkDocs can build the docs	10s
build (macos-14)	1m 42s
Check that MkDocs can build the docs with latest Python and uv	17s
Check formatting	17s
build (windows-latest)	5m 14s
build (ubuntu-latest, --all-features)	2m 35s
	19m 8s

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