Report E2E results to GitHub

[kieran-osgood-shopify]

Stack Context

This is Phase 6 of the BrowserStack Maestro E2E stack for Checkout Kit, stacked on BrowserStack Maestro execution.

Parent issue: https://github.com/shop/issues-checkout-kit/issues/1100
Epic: https://github.com/shop/issues-checkout-kit/issues/1084

What?

Adds GitHub reporting for E2E results:

• per-run commit status payloads with stable matrix contexts
• aggregate GitHub Check Run summary
• sticky PR failure comment with a marker
• failure-only PR comment behavior
• actionable failure markdown with device selector, resolved device, suite path, BrowserStack build URL, video, screenshots, Maestro commands/logs, device logs, and network logs
• Bitrise report workflow wiring
• setup docs for the required GitHub token

Why?

Developers should not need to search BrowserStack manually to understand a failed E2E run. Failures should link directly to the actionable artifacts, while green runs should avoid comment noise.

Validation

shadowenv exec -- ruby e2e/test/github_reporter_test.rb
shadowenv exec -- ruby e2e/test/bitrise_pipeline_test.rb
shadowenv exec -- ruby e2e/test/e2e_matrix_test.rb
shadowenv exec -- ruby e2e/test/browserstack_device_resolver_test.rb
shadowenv exec -- ruby e2e/test/maestro_suite_package_test.rb
shadowenv exec -- ruby -c e2e/lib/e2e_github_reporter.rb
shadowenv exec -- ruby -c e2e/scripts/report_e2e_results
shadowenv exec -- bitrise validate -c e2e/bitrise.yml
shadowenv exec -- ruby -e 'require "yaml"; YAML.safe_load_file("e2e/bitrise.yml"); puts "e2e bitrise yaml parsed"'

[kieran-osgood-shopify]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Soft-launch E2E PR checks #364
• Report E2E results to GitHub #363 👈 (View in Graphite)
• Run BrowserStack Maestro from E2E matrix rows #362
• Build React Native iOS E2E IPA artifact #361
• Build React Native Android E2E APK artifact #360
• Add Bitrise E2E pipeline skeleton #357
• Add E2E matrix launch smoke foundation #356
• main

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