build

cli: fix "config unset" to not delete a whole table #16240

Job	Run time
build (ubuntu-latest)	5m 18s
build (macos-13)	7m 54s
build (macos-14)	4m 6s
build (windows-latest)	10m 45s
build (ubuntu-latest, --all-features)	6m 1s
Build jj-lib without Git support	54s
cargo-deny (advisories)	26s
Check protos	27s
Clippy check	2m 41s
cargo-deny (bans licenses sources)	22s
Check that MkDocs can build the docs with Poetry 1.8	23s
Check formatting	16s
Check that MkDocs can build the docs	20s
	39m 53s

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