Add a filter to diff files list
<!--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=403053) </details> <!--IssueSummary end--> It might be overwhelming to have lots of files shown at once on your screen, especially with big cross-functional MRs. Right now we have file filtering in a file tree but it doesn't apply to the file list. We could either: 1. Add a separate filter for a file list 2. Apply the filter from a file tree to a file list
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