Remove remaining references to airflow examples catalogs

[kiersten-stokes]

Closes #2422

What changes were proposed in this pull request?

This PR cleans up a few remaining items related to the elyra-examples-airflow-catalog that is now deprecated, including:

• Removes install/uninstall of the airflow examples from the catalog in the Makefile
• Removes elyra-examples-airflow-catalog from test_requirements.txt and in setup.py test_requires
• Changes the Airflow tests to rely on a url-type catalog (rather than the example catalog) that contains only a single operator (BashOperator). Related changes include:
  • Adds bash_operator.py to the test/pipeline/resources/components folder
    • NOTE: Initial commits referenced the bash_operator.py file hosted in the examples repo (see conftest.py:39) in order to show that tests are passing with this new url catalog. The url has been changes to the Elyra repo one in the latest commit, as this will be the 'permanent' reference (assuming we intend to eventually remove the Airflow examples content in the examples repo)
  • Changes some of the sample and validation pipelines in test/pipeline/resources to only refer to the BashOperator component (whereas the examples catalog previously had 4 available components that were referenced in these pipelines)

How was this pull request tested?

Tests are now passing with the changes mentioned above.

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[elyra-bot]

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[ptitzler]

LGTM, pending the change in conftest.py (which will temporarily break the CI tests until the PR is merged.

[kiersten-stokes]

With the latest commit, there will be the following expected test failures/errors:

FAILED elyra/tests/pipeline/test_validation.py::test_pipeline_aa_parent_node_missing_xcom_push[catalog_instance0] - KeyError: 'current_parameters'
FAILED elyra/tests/pipeline/airflow/test_component_parser_airflow.py::test_component_catalog_can_load_components_from_registries[catalog_instance0] - assert 0 > 0
FAILED elyra/tests/pipeline/airflow/test_processor_airflow.py::test_same_name_operator_in_pipeline[catalog_instance0-resources/validation_pipelines/aa_operator_same_name.json] - AttributeError: 'NoneType' object has no attribute 'properties'
ERROR elyra/tests/pipeline/airflow/test_processor_airflow.py::test_create_file_custom_components[catalog_instance0-resources/sample_pipelines/pipeline_with_airflow_components.json] - AttributeError: 'NoneType' object has no attribute 'properties'

[ptitzler]

With the latest commit, there will be the following expected test failures/errors:

Confirmed! Other changes look good 👍