hide UI merge button until readyForMerge label present
We had an accidental press of the GitLab UI Merge button for a merge request that was "ready" by GitLab's built-in standards, but not by ours -- it didn't have the readyForMerge label yet. We think we can neatly solve this problem by adding an additional mandatory approval from the cki-kwf-bot, which is automatically given at the point when the bot adds readyForMerge. Merges can still be done manually behind the scenes, or we can edit the required approval rule if we need to get around this, but it should prevent any accidental premature merges via UI misclick.