Create gem for FileBody class and monkey-patch
<!--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=554607) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=554607) </details> <!--IssueSummary end--> ## Phase 1: Research and Gem Creation - Review and understand the existing MR gitlab!128869 implementation - Research GitLab gem structure and requirements - Determine the best architectural approach based on maintainer feedback - Create the gem structure with the FileBody class and monkey-patch - Address architectural concerns about where components should live This is weight 3 because we don't do this kind of work all the time, there will be a learning curve, and the amount of existing context to take in is significant.
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