build

Enforce selected clippy lints, and small style fixes #14682

Job	Run time
build (ubuntu-latest)	4m 26s
Build jj-lib without Git support	47s
build (macos-13)	5m 43s
cargo-deny (advisories)	24s
build (macos-14)	3m 25s
cargo-deny (bans licenses sources)	21s
Check protos	30s
build (windows-latest)	10m 2s
build (ubuntu-latest, --all-features)	5m 22s
Check that MkDocs can build the docs	19s
Check formatting	16s
Clippy check	2m 26s
Check that MkDocs can build the docs with Poetry 1.8	22s
	34m 23s

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