After merge, mark all "Set you as an approver" todos for that MR as completed
Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.
After a merge request is merged, there is no action for an approver to do, beyond a needless "Approve additionally".
We should clear these todos after an MR is merged, as there is no further action.
Suggested here (ephemeral chat link). @gweaver suggested doing something similar when an issue is closed, however I don't think that's as clear-cut a case, since if I'm mentioned on an issue, even a closed one, there may still be useful actions for me there, such as responding late, or even reading what lead to the issue being closed. Therefore I think we should limit this scope to merged MRs for which I received a "Set you as an approver" todo.