cli: improve `jj version` output #11634

Job	Run time
Build jj-lib without Git support	41s
build (ubuntu-latest)	4m 5s
build (macos-14)	3m 24s
cargo-deny (advisories)	23s
build (windows-latest)	9m 43s
cargo-deny (bans licenses sources)	23s
build (ubuntu-latest, --all-features)	4m 52s
Check protos	34s
Clippy check	2m 30s
Check that MkDocs can build the docs	24s
Check that MkDocs can build the docs with Poetry 1.8	25s
Check formatting	19s
	27m 43s

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