Abort generic component processing when prereq download fails

[ptitzler]

Fixes #2624

Example output for KFP when the user assigned an invalid value to environment variable ELYRA_REQUIREMENTS_URL:

Example output for Airflow when the user assigned an invalid value to environment variable ELYRA_REQUIREMENTS_URL:

What changes were proposed in this pull request?

• When running generic nodes on KFP and Airflow, processing is aborted as soon as download of a prerequisite fails, preventing bootstrapper errors.
• Log file to be downloaded, to simplify troubleshooting

Note: https://curl.se/docs/manpage.html#-f does not identify a version in which the option was introduced, which makes me believe that using it does not introduce a new restriction for a more current curl installation.

How was this pull request tested?

Confirmed that the log out yields the expected results when the user misconfigures environment variables ELYRA_REQUIREMENTS_URL, ELYRA_PIP_CONFIG_URL, ELYRA_GITHUB_ORG, orELYRA_GITHUB_BRANCH.

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