Allow to stop pipeline from MR widget
<!--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=23544) </details> <!--IssueSummary end--> Sometimes, in a MR, I know that the pipeline will fail, or there's no use in running it and I forgot to add `[ci skip]` to the commit, so I want to stop it. In order to stop it, I have to open the pipelines tab, although I have the pipeline in the MR widget. It would save me a click if we could stop the pipeline from the mr widget /cc @jlenny @dimitrieh
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