build

git: add `git.colocate` to colocate repos by default #12269

Job	Run time
Build jj-lib without Git support	42s
build (ubuntu-latest)	4m 7s
build (macos-14)	3m 36s
Check protos	26s
cargo-deny (advisories)	23s
build (windows-latest)	9m 11s
cargo-deny (bans licenses sources)	22s
build (ubuntu-latest, --all-features)	5m 0s
Check that MkDocs can build the docs	25s
Check that MkDocs can build the docs with Poetry 1.8	23s
Clippy check	2m 24s
Check formatting	16s
	27m 15s

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