Draft: Add Jest coverage export to ClickHouse

Richard Chongrequested to merge
test-e2e-frontend-test-mapping-validation into master

What does this MR do and why?

Add Jest coverage export to ClickHouse

Adds a new CI job test-coverage:export-jest that exports Jest test coverage data to ClickHouse for analysis. This complements the existing RSpec coverage export.

Also adds infrastructure for future E2E frontend coverage merging:

  • Scripts to download E2E coverage from child pipelines
  • Scripts to merge Jest and E2E coverage in Istanbul format
  • Job test-coverage:export-jest-and-e2e (currently inactive due to timing mismatch between Jest coverage and BABEL_ENV=istanbul)

The E2E merge job requires both coverage-frontend (runs on default branch pushes) and BABEL_ENV=istanbul (only set on schedules). A future MR will align these conditions to enable the merged coverage export.

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Before After

How to set up and validate locally

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