Use rich file icons in find file rows
<!--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> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=213089) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=213089) </details> <!--IssueSummary end--> With https://gitlab.com/gitlab-org/gitlab/-/merge_requests/28112 we will be using our rich file icons for the repository tree rows. To be consistent across the app we should also update https://gitlab.com/gitlab-org/gitlab/-/find_file/master to use these icons. ## Solution Our rich file icons exist mainly in Vue, so I wonder if in this case it is easier and less hacky to re-write this page to be a Vue app. /cc @andr3
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