Bulk edit merge requests should support merging
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=432666) </details> <!--IssueSummary end--> ### Proposal When clicking "Bulk edit" on a "Merge requests" page, there should simply be a button available to merge the selected merge requests ASAP. This would make automated version updates (from Renovate or the like) go from a massive chore (open up dozens of tabs, and press "Merge" in each of them) to a small handful of steps on a single page. <!-- Label reminders Use the following resources to find the appropriate labels: - Use only one tier label choosing the lowest tier this is intended for - https://gitlab.com/gitlab-org/gitlab/-/labels - https://about.gitlab.com/handbook/product/categories/features/ -->
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