build

tests: use get_branch_output() helper thoroughly in test_git_* #11199

Job	Run time
build (ubuntu-latest)	3m 57s
cargo-deny (advisories)	23s
build (macos-14)	2m 59s
Check protos	30s
cargo-deny (bans licenses sources)	22s
build (windows-latest)	8m 33s
Check that MkDocs can build the docs with Poetry 1.3.2	33s
build (ubuntu-latest, --all-features)	4m 47s
Check formatting	14s
Clippy check	2m 22s
Check that MkDocs can build the docs	25s
	25m 5s

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