build

Enforce selected clippy lints, and small style fixes #14688

Job	Run time
build (ubuntu-latest)	4m 32s
build (macos-13)	5m 47s
Build jj-lib without Git support	43s
cargo-deny (advisories)	23s
build (macos-14)	3m 30s
cargo-deny (bans licenses sources)	24s
build (windows-latest)	8m 46s
Check protos	33s
Clippy check	2m 41s
build (ubuntu-latest, --all-features)	5m 25s
Check that MkDocs can build the docs	21s
Check that MkDocs can build the docs with Poetry 1.8	25s
Check formatting	18s
	33m 48s

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