Karma failure in ee/spec/javascripts/monitoring/components/dashboard_spec.js

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28555 caused some EE karma tests to fail

✖ renders custom metrics form fields
          Chrome
        Failed: Error in created hook: "TypeError: Cannot read property 'dispatch' of undefined"
        
        found in
        
        ---> <Dashboard> at ee/app/assets/javascripts/monitoring/components/dashboard.vue

Seen in https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/220295684