Create tests to confirm that expiring environment variables are still valid

[anth-volk]

There are a few environment variables in use within the API that frequently expire, but we must run the entire test suite to know that they are expired, and then we typically receive arcane test errors when they do emerge. We should have a small suite of tests that runs before all others (this is critical) that ensures these are still valid. I'll update this issue down the road to list what they are and suggest a simple way of testing each, but I think it's around at most 3.

Overall, addressing this issue would require the following:

• Write a simple test for each environment variable (will elaborate later)
  • HUGGING_FACE_TOKEN: Attempt to make a request to the whoami endpoint and assure this returns a 200 (https://huggingface.co/docs/hub/en/api#get-apiwhoami-v2)
  • POLICYENGINE_GITHUB_MICRODATA_AUTH_TOKEN: Will elaborate within Slack
• Modify GitHub Actions push and pull_request scripts to run this before other tests
• (Potentially) Modify Makefile to create command to run the relevant tests