completion: teach operation commands about ids #16112

Job	Run time
Check protos	23s
Check formatting	22s
Build jj-lib without Git support	43s
build (ubuntu-latest)	5m 2s
cargo-deny (advisories)	23s
build (macos-13)	6m 57s
Clippy check	2m 49s
cargo-deny (bans licenses sources)	30s
Check that MkDocs can build the docs	20s
build (macos-14)	3m 56s
Check that MkDocs can build the docs with Poetry 1.8	19s
build (windows-latest)	9m 26s
build (ubuntu-latest, --all-features)	6m 2s
	37m 12s

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