build

Rewrite rebasing in `jj split` using `transform_descendants()` #10649

Job	Run time
build (ubuntu-latest)	4m 18s
build (macos-14)	3m 16s
Check that MkDocs can build the docs	21s
build (windows-latest)	7m 33s
build (ubuntu-latest, --all-features)	5m 8s
Check that MkDocs can build the docs with Poetry 1.3.2	34s
Check formatting	16s
cargo-deny (advisories)	22s
cargo-deny (bans licenses sources)	25s
Clippy check	2m 14s
Check protos	25s
	24m 52s

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