Fix "Copy to clipboard" action button has a mismatching white background.

What does this MR do?

Adds a class to all the clipboard icons which removes the extra padding. It also fixes some odd overlay when over the clipboard icon in commits list.

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

No.

Why was this MR needed?

To fix the extra padding and background color that was visible when it should not be

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• 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 #22635 (closed)