build

op heads: remove now-unused methods for adding/removing op heads #8281

Job	Run time
Check that MkDocs can build the docs	22s
Check protos	29s
build (ubuntu-latest)	4m 43s
Check that MkDocs can build the docs with Poetry 1.3.2	33s
Check formatting	17s
build (macos-13)	5m 3s
build (windows-latest)	7m 57s
build (ubuntu-latest, --all-features)	5m 56s
cargo-deny (advisories)	27s
cargo-deny (bans licenses sources)	28s
Clippy check	2m 16s
	28m 31s

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