Api cherry pick

What does this MR do?

Adds the ability to cherry pick a commit via the API. Right now it only supports to directly cherry pick a commit and not starting a MR from it. Shall we do that also for the API?

Does this MR meet the acceptance criteria?

• Changelog entry added
• 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 #25450 (closed)