build

cli: make "op abandon" not fail with multiple op heads #12955

Job	Run time
Check protos	35s
Build jj-lib without Git support	42s
build (ubuntu-latest)	4m 23s
build (macos-14)	3m 20s
build (windows-latest)	8m 13s
cargo-deny (advisories)	22s
build (ubuntu-latest, --all-features)	5m 24s
cargo-deny (bans licenses sources)	22s
Clippy check	2m 39s
Check that MkDocs can build the docs	23s
Check that MkDocs can build the docs with Poetry 1.8	22s
Check formatting	17s
	27m 2s

Provide feedback