build

Rewrite rebasing in `jj split` using `transform_descendants()` #10648

Job	Run time
Check that MkDocs can build the docs	25s
build (ubuntu-latest)	4m 18s
Check protos	24s
build (macos-14)	3m 9s
build (windows-latest)	7m 46s
Check that MkDocs can build the docs with Poetry 1.3.2	34s
Check formatting	14s
cargo-deny (advisories)	22s
build (ubuntu-latest, --all-features)	5m 17s
cargo-deny (bans licenses sources)	26s
Clippy check	2m 36s
	25m 31s

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