Remove unnecessary filter reload

What does this MR do?

Removes unnecessary web requests when the user opens the label filter and dismisses the dropdown.

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

Just need to double check that the logic makes sense and the code is clear.

Why was this MR needed?

Decrease unnecessary web requests to API

What are the relevant issue numbers?

Closes #20116 (moved)

Does this MR meet the acceptance criteria?

• CHANGELOG entry 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