feat(skills): add GCSFuse integration testing skill

[PranjalC100]

Description

Introduces a comprehensive, step-by-step developer runbook and template skeleton for creating, structuring, and verifying integration tests in the GCSFuse repository.

The main skill is defined in a modular Phase-by-Phase layout, and its raw boilerplate templates have been separated into standalone, compilable Go files inside a dedicated subfolder to prevent text bloat:

• Runbook: .gemini/skills/integration-tests/SKILL.md (covers planning workflows, dynamic GCS configurations/compatibilities filtering, only-dir conversions, GKE flag path overrides, safe regex flag parsers, testifying scenario conventions, AAA guidelines, active polling via operations.RetryUntil to avoid raw sleeps flakiness, and improved_run_e2e_tests.sh registration rules).
• Lifecycle/TestMain Boilerplate: .gemini/skills/integration-tests/templates/setup_test.go
• Arrange-Act-Assert Suite Scenario Boilerplate: .gemini/skills/integration-tests/templates/dummy_feature_test.go

Link to the issue in case of a bug fix.

Fixes b/516343927

Testing details

1. Manual - N/A
2. Unit tests - N/A
3. Integration tests - N/A

Any backward incompatible change? If so, please explain.

N/A

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.71%. Comparing base (11ac2fc) to head (0622386).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4732      +/-   ##
==========================================
+ Coverage   83.70%   83.71%   +0.01%     
==========================================
  Files         168      168              
  Lines       20740    20740              
==========================================
+ Hits        17360    17363       +3     
+ Misses       2734     2732       -2     
+ Partials      646      645       -1     

Flag	Coverage Δ
unittests	83.71% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

Hi @alleaditya, @thrivikram-karur-g, @meet2mky, @anushka567, @vipnydav, @abhishek10004, your feedback is needed to move this pull request forward. This automated reminder was triggered because there has been no activity for over 24 hours. Please provide your input when you have a moment. Thank you!

[github-actions]

Hi @alleaditya, @thrivikram-karur-g, @meet2mky, @anushka567, @vipnydav, @abhishek10004, your feedback is needed to move this pull request forward. This automated reminder was triggered because there has been no activity for over 24 hours. Please provide your input when you have a moment. Thank you!

[github-actions]

Hi @alleaditya, @thrivikram-karur-g, @meet2mky, @anushka567, @vipnydav, @abhishek10004, your feedback is needed to move this pull request forward. This automated reminder was triggered because there has been no activity for over 24 hours. Please provide your input when you have a moment. Thank you!