feat: use the frontendmonitoringmiddleware if configured

[deborahgu]

• enables the front end monitoring middleware

FIXES: APER-3470

Run JavaScript tests locally with Karma

There is work being done on a fix to get Karma to run in CI. Until then, however, contributors are required to run these tests locally.

• [ ] Make sure you are inside the devstack container
• [ ] Run make test-karma
• [ ] All tests pass