Add deleted event for merge request webhook

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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.