Add date of emoji reaction to tooltip
<!--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=565392) </details> <!--IssueSummary end--> … to align with how comments are displayed. This is helpful to know if the emoji reaction had been there with the last review or if it is new: ![image](/uploads/fe879b9ef8577d11c422b218dc5825e9/image.png) Another use case would be to see whether the reaction is for the current version if the comment has been edited or a previous one. However, I can see that this might become problematic if there are more than one person reacting to it.
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