Add `deleted` event for merge request webhook
<!--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=347354) </details> <!--IssueSummary end--> ## Problem to Solve Merge requests support the following events: - open - close - reopen - update - approved - unapproved - merge This is missing an event for `deleted` which could happen to an MR. For systems relying on events they would suddenly have information on an MR that no longer exists and not be able to take any action. ## Proposal An additional webhook event should be sent for when a merge request is deleted.
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