remove outline from More Actions icon when dropdown open

What does this MR do?

Override :focus style

The only ways to trigger focus state now:

• tab to the button
• click the icon when dropdown is open. Dropdown closes and button gets focus

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

I am assuming we prefer outline: 0 to outline: none.

Screenshots (if relevant)

For some reason mouse isn't visible in the gif :(

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 #33469 (closed)