Adding workflows for unit tests and linting

[ericbuckley]

Description

Adding 4 different GitHub workflows to help with managing code checks.

1. unit tests
2. linting
3. code vulnerabilities
4. dependency vulnerabilities

Related Issues

closes #7

Additional Notes

Also removing the scripts/vulnerability_checks.sh script as we're going to try using GH tools (ie CodeQL and Dependabot) for managing those checks and won't need an independent script for it anymore.

Checklist

Please review and complete the following checklist before submitting your pull request:

• [x] I have ensured that the pull request is of a manageable size, allowing it to be reviewed within a single session.
• [x] I have reviewed my changes to ensure they are clear, concise, and well-documented.
• [x] I have updated the documentation, if applicable.
• [x] I have added or updated test cases to cover my changes, if applicable.
• [x] I have minimized the number of reviewers to include only those essential for the review.
• [x] I have notified teammates in the review thread to build awareness.

Checklist for Reviewers

Please review and complete the following checklist during the review process:

• [ ] The code follows best practices and conventions.
• [ ] The changes implement the desired functionality or fix the reported issue.
• [ ] The tests cover the new changes and pass successfully.
• [ ] Any potential edge cases or error scenarios have been considered.