Decrease `coverage-frontend` duration from 7 minutes

What is the productivity problem to solve?

Currently, coverage-frontend duration is 7 minutes and growing: https://app.periscopedata.com/app/gitlab/652085/Engineering-Productivity---Pipeline-Build-Durations?widget=7910777&udv=1005715

Before	After

Problem identification checklist

• The root cause of the problem is identified.
• The surface of the problem is as small as possible.

Verify that the solution has improved the situation

Expected improvement: TBD

• The solution improved the situation.
  • If yes, check this box and close the issue. Well done! 🎉
  • Otherwise, create a new "Productivity Improvement" issue. You can re-use the description from this issue, but obviously another solution should be chosen this time.