Generalize heatmap logic and add support for flakiness

What does this MR do and why?

This adds a heatmap table for failureflaky-test issues ( flakiness1, flakiness2, flakiness3, flakiness4) quarantined (quarantine) and not quarantined.

Expected impact & dry-runs

Example of an actual heatmap for the groupsource code generated from the upcoming updated triage-ops implementation (links are all functional 🎉):

	flakiness1	flakiness2	flakiness3	flakiness4	No flakiness status
No quarantined	2	1	43	392	18
quarantine	1	-	-	-	2

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review

Closes #1506 (closed)