git: add git colocate command #6806

Job	Run time
build (no git)	1m 28s
test (linux-x86_64-gnu)	6m 14s
test (macos-x86_64)	5m 35s
test (macos-aarch64)	5m 30s
test (windows-x86_64)	17m 38s
test (windows-aarch64)	15m 49s
check (protos)	2m 18s
check (doctests)	3m 2s
check (zizmor)	22s
test (linux-aarch64-gnu)	5m 7s
check (mkdocs)	20s
nix flake (ubuntu-24.04)	7m 30s
nix flake (macos-14)	8m 30s
check (latest mkdocs, optional)	7m 29s
check (rustfmt)	19s
check (Cargo.lock dependency count)	5s
check (clippy)	1m 26s
check (cargo-deny, advisories)	26s
nix flake (ubuntu-24.04-arm)	7m 41s
check (codespell)	15s
check (cargo-deny, bans)	34s
check (cargo-deny, sources)	29s
check (cargo-deny, licenses)	22s
required checks (merge queue)	0s
	1h 38m 29s

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