test(integration): add dedicated NPI test suite to e2e test runner

[kislaykishore]

Description

This PR introduces a dedicated integration test configuration for NPI related tests: CLI Runner Integration (--npi)
Added --npi option to improved_run_e2e_tests.sh to trigger NPI test groups across Flat and HNS regional buckets.

Link to the issue in case of a bug fix.

b/530771587

Testing details

1. Manual - Verified code layout, formatting, linting, and build via make build. Validated shell scripts syntax with bash -n.
2. Unit tests - N/A
3. Integration tests - Ran the tests manually

Any backward incompatible change? If so, please explain.

N/A

[gemini-code-assist]

Code Review

This pull request introduces support for running Network Protocol Integration (NPI / Pirlo) end-to-end tests. It adds a new --npi flag to improved_run_e2e_tests.sh and handles the RUN_TESTS_FOR_NPI environment variable in build.sh to trigger the NPI test suite across both HNS and FLAT bucket layouts. I have no feedback to provide as there are no review comments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (0673d19) to head (d1ae560).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #5015       +/-   ##
==========================================
- Coverage   83.81%       0   -83.82%     
==========================================
  Files         174       0      -174     
  Lines       21376       0    -21376     
==========================================
- Hits        17916       0    -17916     
+ Misses       2779       0     -2779     
+ Partials      681       0      -681     

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[github-actions]

Hi @meet2mky, @charith87, 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 @meet2mky, @charith87, 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 @meet2mky, @charith87, 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 @meet2mky, @charith87, 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!