[Phase 7] Soft-launch E2E PR checks

[kieran-osgood-shopify]

Stack Context

This is Phase 7 of the BrowserStack Maestro E2E stack for Checkout Kit, stacked on GitHub E2E reporting.

Parent issue: https://github.com/shop/issues-checkout-kit/issues/1101
Epic: https://github.com/shop/issues-checkout-kit/issues/1084

What?

This PR adds the "pull_request" trigger to the bitrise config, launching the e2e pipeline when a PR is created
Skips draft PR's

• E2E_STRICT=false means the failures are soft failures, when we're certain the pipeline is stable we can set E2E_STRICT=true, keeps assertion failures reportable without blocking initial PR progress
  (Technically even without E2E_STRICT they wouldn't be blocking because we havent marked the bitrise status checks as required, however it gives us an opt out in future too)
• uses rolling builds to cancel BrowserStack builds on timeout or duplicate runs

Why?

The E2E pipeline should start non-blocking while the infrastructure and suite stabilize. Developers still get commit statuses, Check Runs, and actionable failure comments, but PR progress is not blocked until we are confident that the checks are free of false positives

Results

Topology on Bitrise

When one suite is failing

After fixing all the tests you'll see the workflow update the comment

[kieran-osgood-shopify]

• [Phase 7] Soft-launch E2E PR checks #364 : 2 dependent PRs (#401 , #417 ) 👈 (View in Graphite)
• [Phase 6] Report E2E results to GitHub #363
• [Phase 5] Run BrowserStack Maestro from E2E matrix rows #362
• [Phase 4] Build React Native iOS E2E IPA artifact #361
• [Phase 3] Build React Native Android E2E APK artifact #360
• [Phase 2] Add Bitrise E2E pipeline skeleton #357
• [Phase1] Add E2E matrix launch smoke foundation #356
• main

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[bitrise]

🤖 Bitrise Build Report > Checkout Kit E2E > e2e > #55: ✅ SUCCESS

• Duration: 8m 48s
• Workflows: 6 total / 6 executed / 0 aborted / 0 skipped / 0 failed / 6 successful

[kieran-osgood-shopify]

^I have disabled these bitrise build report comments so its only the one we manually post above in future