Truncate long labels with ellipsis in labels page

What does this MR do?

Fixes #22953 (closed), where long labels overlaps into the description field in the labels page. Truncates long labels with ellipsis. Labels that fit are unaffected.

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

No

Why was this MR needed?

Fixes #22953 (closed).

Screenshots (if relevant)

Existing behavior:

With the change:

Does this MR meet the acceptance criteria?

• CHANGELOG entry 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 you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #22953 (closed)