enable to skip all setup and only run e2e tests

[YaoZengzeng]

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[gemini-code-assist]

Summary of Changes

Hello @YaoZengzeng, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the end-to-end testing workflow by introducing an option to bypass the time-consuming setup phase. This allows developers to quickly re-run tests against an existing, pre-configured Kubernetes cluster, streamlining the development and debugging cycle for e2e tests.

Highlights

• New E2E_SKIP_SETUP variable: Introduced a new environment variable, E2E_SKIP_SETUP, to control the execution of the e2e test setup process.
• Conditional Setup Execution: Modified the run_e2e.sh script to conditionally skip all setup steps, including Kind cluster creation, image building, and service deployments, when E2E_SKIP_SETUP is set to true.
• Documentation Update: Updated the test/e2e/README.md to document the new E2E_SKIP_SETUP variable, explaining its purpose and providing an example of its usage.

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[gemini-code-assist]

Code Review

This pull request introduces a new E2E_SKIP_SETUP environment variable to allow skipping the entire setup phase for e2e tests. This is a useful feature for faster re-runs when the test environment is already configured. The changes correctly implement this logic in run_e2e.sh and update the README.md with documentation for the new option. My review includes one suggestion to improve the script's readability and maintainability by refactoring the new conditional logic.

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✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Files           ?       29           
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  Hits            ?      870           
  Misses          ?     1540           
  Partials        ?      123           

Flag	Coverage Δ
unittests	34.34% <ø> (?)

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[YaoZengzeng]

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