Add missing pagination on the commit diff endpoint

What does this MR do?

Add missing pagination on the commit/:sha/diff endpoint

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

The pagination seems necessary when there are more than 20 files in a diff.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Closes #43370 (closed)