Move award emoji's out of the discussion tab for merge requests

What does this MR do?

Moves award emoji's out of the discussion tab for merge requests

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

perhaps some tests will fail?

Why was this MR needed?

Emojis may want to be awarded from other views than just the discussion tab, for example from the diff view

Screenshots (if relevant)

current situation:

result:

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 #25996 (closed)