build

Add config flag to control `prev/next` edit behaviour. #13515

Job	Run time
build (ubuntu-latest)	4m 29s
build (macos-13)	6m 31s
Build jj-lib without Git support	41s
Check protos	50s
build (macos-14)	3m 42s
Check that MkDocs can build the docs	21s
build (windows-latest)	8m 51s
Check that MkDocs can build the docs with Poetry 1.8	24s
build (ubuntu-latest, --all-features)	5m 34s
Check formatting	14s
cargo-deny (advisories)	24s
cargo-deny (bans licenses sources)	33s
Clippy check	2m 30s
	35m 4s

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