build

Enforce selected clippy lints, and small style fixes #14726

Job	Run time
Build jj-lib without Git support	55s
build (ubuntu-latest)	4m 24s
Check protos	26s
Check that MkDocs can build the docs	22s
build (macos-13)	7m 29s
Check that MkDocs can build the docs with Poetry 1.8	21s
build (macos-14)	3m 53s
Check formatting	16s
build (windows-latest)	9m 45s
build (ubuntu-latest, --all-features)	5m 26s
cargo-deny (advisories)	23s
cargo-deny (bans licenses sources)	24s
Clippy check	2m 41s
	36m 45s

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