Cloud Runner Test Improvements

[frostebite]

Changes

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Related Issues

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Related PRs

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Successful Workflow Run Link

PRs don't have access to secrets so you will need to provide a link to a successful run of the workflows from your own
repo.

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Checklist

• Read the contribution guide and accept the
  code of conduct
• Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make a PR
  in the documentation repo)
• Readme (updated or not needed)
• Tests (added, updated or not needed)

Summary by CodeRabbit

• New Features

  • CI: new CI Jest config and test:ci script, test polyfill, single JS Jest setup; added Cloud Runner integrity workflows (including LocalStack) and removed legacy CI pipeline.
  • AWS: per-service endpoint support, centralized AWS client factory, S3-backed workspace locking/storage.
  • Runtime: improved container/non-container build flows and LocalStack-friendly env propagation.

• Bug Fixes

  • More robust task execution with retries/backoff, throttle handling, safer provider defaults, and consistent log appending.

• Tests

  • Tests opt into cloudRunnerDebug, include platform/tool gating/skips, and adopt a boolean BuildSucceeded indicator.

• Chores

  • Layered LFS fallbacks, guarded cache pushes/cleanup, README reflow, ESLint override for Jest setup.