issue/194: Add snyk scan to cicd workflow

[jackiryan]

Github Issue: #194

Description

This change is intended to address security vulnerabilities in the ECR repo in support of consolidated cumulus deployment of bignbit. As an aside, it also fixes a minor unticketed bug needed for harmony-flow support.

Overview of work done

• Add snyk scanning to cicd-pipeline.yml Github actions workflow to detect security vulnerabilities
• Fix a minor bug related comma-separated variable lists required for harmony-flow support
• Fix security vulnerabilities found by python and docker image scans.

Overview of verification done

• Deploy version to services-sit venue
• Run bignbit regression tests and confirm no failures
• Run unit tests

Overview of integration done

• Deploy version to consolidated cumulus environment
• Confirm AWS security scans notes no further high or critical vulnerabilities

PR checklist:

• Linted
• Updated unit tests
• Updated changelog
• Integration testing

See Pull Request Review Checklist for pointers on reviewing this pull request

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