Improve integration tests

[Hedingber]

• minimize env vars required for integration test
• add this code snippet wherever ! is being used in the notebooks so the cell execution (and as an outcome the test) will fail if the command execution failed

if _exit_code != 0:
    raise RuntimeError()

• change wait_for_pipeline_completion default expected_statuses to be [ Succeeded ] (was empty) and other correctness and docs changes for this function
• use wait_for_pipeline_completion in the test notebooks so that test will fail when the pipeline fail (and will succeed only after pipeline finished successfully)

[review-notebook-app]

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