build

cli: add label for line numbers in `--color-words` diff #11959

Job	Run time
Build jj-lib without Git support	45s
build (ubuntu-latest)	4m 9s
cargo-deny (advisories)	23s
Check protos	25s
build (macos-14)	4m 29s
cargo-deny (bans licenses sources)	24s
build (windows-latest)	9m 22s
build (ubuntu-latest, --all-features)	5m 1s
Clippy check	2m 31s
Check that MkDocs can build the docs	23s
Check that MkDocs can build the docs with Poetry 1.8	20s
Check formatting	14s
	28m 26s

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