Distinguish thumb reaction emoji on Merge Request list if reacted by user

Problem to Solve

Currently on the Merge Request list you can only see if there are thumbs on a Merge Request or not, you can't easily see if you have left a thumbs up or thumbs down on a given merge request.

Proposal

If you've reacted with a thumbs emoji on a merge request the given icon should be filled in (similar to the approvers icon).