build

git: migrate import_refs() to diffing git_refs and known remote refs #7217

Job	Run time
build (ubuntu-latest)	6m 40s
Check protos	45s
build (macos-13)	4m 23s
build (windows-latest)	12m 48s
Clippy check	3m 34s
build (ubuntu-latest, --all-features)	8m 14s
Check that MkDocs can build the docs	24s
Check formatting	17s
cargo-deny (advisories)	36s
cargo-deny (bans licenses sources)	34s
	38m 15s

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