cli: fix: replace obsolete todo with a new one #12824

Job	Run time
Build jj-lib without Git support	42s
build (ubuntu-latest)	4m 40s
Check protos	40s
build (macos-14)	3m 19s
build (windows-latest)	9m 11s
Check that MkDocs can build the docs	20s
Check formatting	23s
build (ubuntu-latest, --all-features)	5m 21s
Clippy check	2m 36s
Check that MkDocs can build the docs with Poetry 1.8	26s
cargo-deny (advisories)	22s
cargo-deny (bans licenses sources)	26s
	28m 26s

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