Revert "Conditionally pass Hugging Face tokens for download when repo is private"

[anth-volk]

Reverts #321

Currently, in -api, the test at https://github.com/PolicyEngine/policyengine-api/actions/runs/12402725316/job/34625177069 fails because the API is unable to find the underlying dataset. Considering the timing and the fact that, when running locally using a previous version of -core, this test doesn't fail, I would imagine the cause of this problem is this code. Considering how important this code is, out of an abundance of caution, I am rolling back this code until we can determine the cause of the problem.

If experiencing the original issue (whereby, in a -us notebook, one doesn't have a token for Hugging Face, and is thus unable to run any code), a very simple workaround is to just hit enter when the token is requested. The code will work as expected, as the Hugging Face US repo is public.

[anth-volk]

Just a note: when running the failing test locally with the newest version of -core, the test does pass. I'm going to do a bit of digging to see if perhaps the issue is something related to the test, but it may still be best to merge this out of an abundance of caution.

[anth-volk]

Turns out the issue is that it's just downloading to the wrong filepath, though I don't yet understand why this wasn't an issue in the previous implementation. I'm going to put this PR into draft. If I can't fix the issue by EOD today, I'll reopen and advocate reverting, then redoing. I think this will be easy enough to fix, though, so hoping to try today.

[anth-volk]

Closing in favor of #325