Add link to settings from within Merge request area
<!--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=325240) </details> <!--IssueSummary end--> <!-- This template is a great use for issues that are feature::additions or technical tasks for larger issues.--> ### Proposal To help users get to settings from Merge requests there should be link to get to it from the merge requests area. The boring solution is to introduce the `link in the submenu` because this could also be relevant to other product areas like Repository as well. #### Explorations | Link in submenu | Link in page as an icon button | Link close to widget | | ------ | ------ | ------ | | ![image](/uploads/f5a11f1f175663df3637999c07f2914e/image.png) | ![image](/uploads/e52e835a1fb5acacb59d108526b3f5f6/image.png) | ![image](/uploads/960b7913eafe1136419b99ad7517a39e/image.png) | #### Related research This concept of having links to "settings" was explored in this solution validation https://gitlab.com/gitlab-org/ux-research/-/issues/1306#note_506613378 Explored was navigating to "Settings" from Repository and Merge requests and most participants used the "Settings" link in the submenu ([Insights summary](https://dovetailapp.com/projects/011ea00e-71fc-4dce-9562-438055b8e9e8/insights/present/582d31cf-8cbf-48cc-a217-18ac9c26063e))
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