Resolve "clipboard-button tooltip is broken"

What does this MR do?

Adds missing tooltip directive to clipboard button

Screen_Recording_2018-01-10_at_01.23_PM

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered

What are the relevant issue numbers?

Closes #41608 (closed)