git: add git colocate command #6808

Job	Run time
check (protos)	1m 37s
build (no git)	1m 26s
test (macos-x86_64)	8m 8s
test (linux-x86_64-gnu)	6m 13s
test (windows-aarch64)	15m 43s
test (linux-aarch64-gnu)	5m 30s
test (macos-aarch64)	5m 30s
test (windows-x86_64)	16m 49s
nix flake (ubuntu-24.04-arm)	6m 45s
nix flake (macos-14)	13m 7s
nix flake (ubuntu-24.04)	7m 41s
check (rustfmt)	19s
check (zizmor)	22s
check (cargo-deny, bans)	25s
check (cargo-deny, licenses)	29s
check (clippy)	1m 33s
check (cargo-deny, sources)	23s
check (codespell)	15s
check (Cargo.lock dependency count)	5s
check (cargo-deny, advisories)	25s
check (doctests)	3m 3s
check (mkdocs)	14s
check (latest mkdocs, optional)	7m 2s
required checks (merge queue)	-1s
	1h 43m 3s

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