Add test file path to script

[amrit110]

This pull request updates the onboarding CLI to require an explicit path to the integration test script, improving clarity and flexibility for users. The main changes involve modifying the _run_tests_and_finalize function to take the test script path as an argument and updating the CLI to require this argument.

Integration Test Script Handling:

• The _run_tests_and_finalize function now takes a test_script argument, allowing the test script path to be specified externally instead of being hardcoded. [1] [2]
• The function now checks for the existence of the test script at the provided path and returns an error if the script is not found, improving error handling and user feedback.

CLI Argument Updates:

• The CLI now requires a --test-script argument, making the integration test script path a mandatory input for the onboarding process.
• The call to _run_tests_and_finalize in the main function is updated to pass the user-supplied test script path.