Draft: Consolidate E2E coverage and test report collection

Richard Chongrequested to merge
test-coverage-export-pipeline into master

What does this MR do and why?

Consolidate E2E coverage and test report collection

This MR consolidates E2E coverage artifact collection into a single job and updates the coverage export jobs to merge E2E data with unit test data before exporting to ClickHouse.

Changes:

  • Add process-e2e-coverage job that collects all E2E artifacts (backend coverage, frontend coverage, test reports, test mappings)
  • Update test-coverage:export-rspec-and-e2e to merge E2E test mappings with Crystalball mappings before export
  • Update test-coverage:export-jest-and-e2e to merge E2E test mappings with Jest mappings before export
  • Add scripts for merging test mappings and coverage data
  • Use gitlab_quality-test_tooling gem branch with comma-separated pattern support for test reports

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