Inefficient Event Rates CI

[henry-wallace-phys]

• Current CI uses inefficient workflow for event rate checks
• Can be made more like https://github.com/dbarrow257/NuOscillator/blob/main/.github/workflows/CIValidations2.yml
• Needs small refactor to work

[github-actions]

This is your first issue, thank you for contributing to MaCh3 DUNE!