Make Danger warn when a feature flag is removed and title doesn't include `[RUN ALL RSPEC] [RUN AS-IF-FOSS]`
As suggested in gitlab-com/www-gitlab-com#10343 (comment 485698591), we should make Danger warn when a feature flag is removed and title doesn't include [RUN ALL RSPEC] [RUN AS-IF-FOSS]
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Danger could even update the title directly (and even start a new MR pipeline).