Fix awardable button mutuality loading spinners

What does this MR do?

Removes the showing and hiding of loading spinners when an awardable's opposite button is selected.

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

Shouldn't be

Why was this MR needed?

Makes the UI more consistent. Reduces confusion of why another button is showing the loading spinner when it was not clicked on.

What are the relevant issue numbers?

Closes #18380 (closed)

Screenshots (if relevant)

Before:

After:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • 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