WIP: Clear "Labels" dropdown search filter after selection

What does this MR do?

This merge request clears the "Labels" dropdown search filter after a selection is made.

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

No

Why was this MR needed?

The current label selection workflow is impeded by having to clear the search filter after a desired label is selected.

Screenshots (if relevant)

Before

After

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• 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 #24774 (moved)