Add tests and linting to GitHub Actions workflow

[jeafreezy]

Our current workflows do not include running tests and linting as part of the CI/CD process. This can lead to code being merged with undetected lint errors, failing tests going unnoticed, reducing reliability, and lack of enforcement for code quality and consistency.

We need to update our CI/CD workflow to run ESLint on every pull request (PR) push to the main branch and run unit tests using Vitest before merging any changes.