Add doc-only change detection to skip tests

[hengtaoguo]

Description

• Add doc_only_check job to detect when only .md|ipynb files are modified (Later, you can skip more file types such as jpg|png|mp4 if needed):

  • If skip_tests==true: Skip the build process and all unit tests.
  • If skip_tests==false: Execute all remaining build process and unit tests like before.

• Add all_tests_passed to aggregate build and all unit tests status. Later in GitHub branch protection rule, we only check this test. Benefits of doing so:

  • Clear intent: Single "gate" that represents overall health
  • Future-proof: Add/remove/rename test jobs without updating branch protection

Tests

Skip test (doc-only): https://screenshot.googleplex.com/ANutL8W8zpaRP5e
Non-skip test (success): https://screenshot.googleplex.com/BKxyPkxUgAYZvxR
Non-skip test (failure): https://screenshot.googleplex.com/4JU7AtHVWpJ7SMT
Non-skip test (cancel): https://screenshot.googleplex.com/8om8PyDT3vSxJd3

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[github-actions]

🤖 Hi @hengtaoguo, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[github-actions]

🤖 Hi @hengtaoguo, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[github-actions]

## 📋 Review Summary

This pull request introduces a valuable optimization to the CI pipeline by skipping tests for documentation-only changes. The implementation is mostly correct, but contains a critical bug in the final job that aggregates test results.

🔍 General Feedback

• The doc_only_check job is well-implemented and uses a correct method to determine which files have changed.
• The new all_tests_passed job is a good idea for simplifying branch protection rules. However, the logic for checking for failed or cancelled jobs is incorrect and needs to be fixed for it to work as intended.