Fix Python Data Tests & Add to CI Via GitHub Actions

[vkoves]

Description

Adds a GitHub action to run the new tests Alex added, ensuring no new PRs can go through that break data processing. See PR #68 for the original PR adding the tests.

Fixes #79

Testing Instructions

Ran tests locally and in CI

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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[vkoves]

@alexkcode - this PR might interest you, I'm trying to get your tests working on all PRs!

Should we limit this to only run on changes of certain files (related StackOverflow) maybe just .csv and .py changes?

[vkoves]

Looks like the tests now run but have two failures, we'll have to fix or disable those:

[alexkcode]

Looks good! Ran through the tests and did some quick checks on the website.