build

Add background snapshotting info to `debug watchman status`. #11885

Job	Run time
Build jj-lib without Git support	49s
Check that MkDocs can build the docs	22s
build (ubuntu-latest)	4m 9s
build (macos-14)	3m 8s
build (windows-latest)	7m 31s
build (ubuntu-latest, --all-features)	5m 4s
Clippy check	2m 36s
cargo-deny (advisories)	22s
Check that MkDocs can build the docs with Poetry 1.8	32s
cargo-deny (bans licenses sources)	23s
Check protos	42s
Check formatting	16s
	25m 54s

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