build

git: migrate import_refs() to diffing git_refs and known remote refs #7216

Job	Run time
Check that MkDocs can build the docs	35s
Check protos	50s
Check formatting	19s
build (ubuntu-latest)	7m 44s
build (macos-13)	4m 57s
Clippy check	3m 18s
build (windows-latest)	11m 54s
cargo-deny (advisories)	29s
build (ubuntu-latest, --all-features)	8m 2s
cargo-deny (bans licenses sources)	29s
	38m 37s

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