API endpoints award emoji

What does this MR do?

Add endpoints for award emoji but only on MRs and Issues.

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

The problem I ran into, is that I don't now how, in the same structure I can add support with minimal code written, for Notes and later Snippets

Why was this MR needed?

Routes where previously not there

What are the relevant issue numbers?

This MR closes #10884

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 style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together