Model config tests

[curt-tigges]

Description

Added a test to verify that all model configs currently listed in loading_from_pretrained are not None.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• 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
• I have not rewritten tests relating to key interfaces which would affect backward compatibility

[bryce13950]

The failure is due to these tests now triggering http requests on gated models. GitHub does allow for two buckets of variables, and we could put the hf token into the variables section to make this work, but that would involve also allowing access to secrets, which is not possible. It seems like a lot of people are requesting this sort of functionality though, so maybe a solution will come up later https://github.com/orgs/community/discussions/44322. The other solution would be to manually drop on the config for these models, which is very feasible.