We should use "unsafe-merge-queue" instead of "fast-merge-queue", to make it clear the downsides of using a fast merge queue.
<rdar://problem/91435211>
Pull request: https://github.com/WebKit/WebKit/pull/261
Committed r292556 (249394@main): <https://commits.webkit.org/249394@main> Reviewed commits have been landed. Closing #261 and removing active labels.