the merge queue needs help from our status checks to actually work

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https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/configuring-pull-request-merges/managing-a-merge-queue#triggering-merge-group-checks-with-github-actions says something about on: merge_group: and we don't have that config, so the merge queue is forever stuck. I'm turning it off for now until we know what config we need.