build

Rewrite rebasing in `jj split` using `transform_descendants()` #10652

Job	Run time
cargo-deny (advisories)	26s
cargo-deny (bans licenses sources)	31s
build (ubuntu-latest)	4m 11s
Clippy check	2m 16s
Check protos	22s
build (macos-14)	3m 8s
build (windows-latest)	8m 3s
Check that MkDocs can build the docs	22s
Check that MkDocs can build the docs with Poetry 1.3.2	56s
Check formatting	15s
build (ubuntu-latest, --all-features)	5m 19s
	25m 49s

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