lint Jupyter notebooks

[ptitzler]

This PR enables Jupyter notebook linting in this repository and addresses existing linting issues.

Example output if a notebook violates a linting rule:

$ make lint-server
python3 -m flake8 elyra .github
python3 -m black --check --diff --color .
--- elyra/tests/pipeline/resources/validation_pipelines/NotebookA.ipynb	2022-11-30 17:07:18.271081 +0000:cell_0
+++ elyra/tests/pipeline/resources/validation_pipelines/NotebookA.ipynb	2022-11-30 17:07:35.595326 +0000:cell_0
@@ -1 +1 @@
-print('Hello World')
+print("Hello World")
would reformat elyra/tests/pipeline/resources/validation_pipelines/NotebookA.ipynb
Oh no! 💥 💔 💥
1 file would be reformatted, 158 files would be left unchanged.
Black formatting encountered issues.  Use 'make black-format' to apply the suggested changes.
make: *** [lint-server] Error 1

Signed-off-by: Patrick Titzler ptitzler@us.ibm.com

What changes were proposed in this pull request?

• Update linting prerequisites
• Address linting issues
• (setup.py - no functional impact) moved black dependency because the package is now required for Airflow and KFP (Rewrite KFP code generation #2993 introduced that dependency for KFP)

How was this pull request tested?

• CI tests

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