Resolve "API: Separate CE params to avoid wrong conflict resolutions"

Separate CE params on the Grape API to avoid conflicts on CE -> EE merge process.

EE backport

gitlab-ee!1585

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

Other endpoints that have EE exclusive params

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #28017 (closed)