Working on eliminating some technical debt

[P6rguVyrst]

Context

• Upgrade Python to latest version (debug & fix errors along the way)
• Add new error responses to test data.
• Remove dead code, and only support parallel mode which has been renamed to parallel > export

Checklist

• [x] Change meets or does not compromise the Baseline Security Requirements

[wise-github-bot-app[bot]]

:red_circle:

Your CODEOWNERS file is broken, fix the following errors before merging the branch:

• The CODEOWNERS file does not exist. Repository ownership will default to ENGINEERING until you add a CODEOWNERS file with a * rule that assigns it to a team