Create gem for FileBody class and monkey-patch

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Phase 1: Research and Gem Creation

• Review and understand the existing MR !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.