Follow-up from "WIP: Move monitoring dashboard_spec to Jest"

• Make mockMontitoringUtils more generic and move to mocks_helper
• Move setupComponentStore out of dashboard_spec.js

Please view the following MR and discussion for context:

The following discussion from !32571 (merged) should be addressed:

• @winh started a discussion: (+3 comments)

  can we make this either a generic helper thing or check if we can reuse the one in spec/frontend/mocks/mocks_helper.js?