Run karma for qa-* branches

What does this MR do?

This will prevent breaking master.

What are the relevant issue numbers?

See https://gitlab.com/gitlab-org/gitlab-ce/issues/52886#note_109949189.

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides