build

Proof of concept: structured diff of conflicted commits #13217

Job	Run time
build (ubuntu-latest)	4m 26s
build (macos-14)	3m 19s
cargo-deny (advisories)	22s
build (windows-latest)	10m 0s
cargo-deny (bans licenses sources)	26s
build (ubuntu-latest, --all-features)	5m 30s
Check protos	31s
Check that MkDocs can build the docs	22s
Check that MkDocs can build the docs with Poetry 1.8	22s
Check formatting	18s
Clippy check	2m 36s
Build jj-lib without Git support	45s
	28m 57s

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