build

tests: split lib/tests to separate create #14842

Job	Run time
Build jj-lib without Git support	44s
build (ubuntu-latest)	4m 39s
build (macos-13)	8m 3s
build (macos-14)	3m 36s
cargo-deny (advisories)	23s
Check protos	40s
build (windows-latest)	9m 57s
Clippy check	2m 27s
cargo-deny (bans licenses sources)	23s
build (ubuntu-latest, --all-features)	5m 39s
Check that MkDocs can build the docs	22s
Check that MkDocs can build the docs with Poetry 1.8	26s
Check formatting	17s
	37m 36s

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