feat: wip - scriptifying test harness for use outside of tests

[mcmcgrath13]

Description

Please include a summary of the changes and any key information a reviewer may need.

Tickets

• Jira Ticket

Checklist before requesting a review

• PR focuses on a single story
• Code has been fully tested to meet acceptance criteria
• PR is reasonably small and reviewable (Generally less than 10 files and 500 changed lines)
• All new functions/classes/components reasonably small
• Functions/classes/components focused on one responsibility
• Code easy to understand and modify (clarity over concise/clever)
• PRs containing TypeScript follow the Do's and Don'ts
• PR does not contain hardcoded values (Uses constants)
• All code is covered by unit or feature tests