Introduce Rapid Diffs limits
<!--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=553043) </details> <!--IssueSummary end--> Right now Rapid Diffs are using existing diff collection, diff file and app limits. Based on [our performance investigation](https://gitlab.com/gitlab-org/gitlab/-/issues/534953#note_2494414217) we are confident to increase these limits for Rapid Diffs specifically. The exact limit values are TBD.
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