Unpin file from file browser
<!--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=437615) </details> <!--IssueSummary end--> The following discussion from !137544 should be addressed: - [ ] @danmh started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/137544#note_1683735250): > **suggestion** (non-blocking): Consider allowing the file to be unpinned from the file browser > > ![Screenshot 2023-12-07 at 10.57.56.png](/uploads/3e0bcdf9986a50acf605dac9c54f0d90/Screenshot_2023-12-07_at_10.57.56.png){width="158" height="269"} > > _(**note:** my concerns with the pin metaphor are documented in https://gitlab.com/gitlab-org/gitlab/-/issues/433250#note_1683732675 but I think out of scope of this MR.)_
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