Add marker for tests to the onboard cmd

[amrit110]

This pull request introduces support for filtering integration tests by pytest markers in the onboarding CLI, allowing users to run only tests matching a specific marker via a new --test-marker command-line argument. The implementation ensures marker values are correctly passed to the test runner, and comprehensive unit tests verify the new functionality and its integration with the CLI workflow.

Enhancements to integration test filtering:

• Added an optional marker parameter to the run_integration_test function, which forwards the marker as a -m <marker> argument to pytest, enabling selective test execution.
• Extended the _run_tests_and_finalize function to accept and forward a test_marker argument, ensuring marker-based filtering is applied during onboarding. [1] [2] [3]

CLI interface improvements:

• Introduced the --test-marker command-line argument in the CLI, allowing users to specify a pytest marker expression when running integration tests.
• Updated the CLI workflow to pass the test_marker argument through to integration test execution, ensuring marker filtering is consistently applied.

Testing and validation:

• Added unit tests to verify marker forwarding, command structure, and CLI integration, including checks for correct handling of marker presence and absence, and for bypassing tests when skip_test is set. [1] [2]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.87%. Comparing base (9b629bd) to head (35cba36).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   89.84%   89.87%   +0.02%     
==========================================
  Files          10       10              
  Lines        1438     1442       +4     
==========================================
+ Hits         1292     1296       +4     
  Misses        146      146              

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