Allow merge request author to clear thumbs up

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Problem to solve

When doing large changes inside a merge request (due to reviewer feedback or not), It would be very nice to be able to clear out the 👍 that were initially given before the changes where pushed

Target audience

• Sasha, Software Developer, https://design.gitlab.com/research/personas#persona-sasha

Further details

From time to time, we make some kind of large refactors / changes during the life of a merge request.

Some reviewers may have given their thumbs up before those were made, and the author would like them to take another look (for example, the scope of the feature changed slightly)

We can notify them individually for an additional review, but there is currently no way beside checking comments that they are still OK with the changes

For context, we're using another tool to link with gitlab and list current merge requests and the +1/-1 in a daily meeting, so the information we have is limited

Proposal

Add an additional button / option in the merge request interface for the merge request author (and repo admin maybe). That will remove all the thumbs up that were previously given

A comment might also be added to automatically notify the reviewers that their thumbs up where cleared