Remove torchhub test
# What does this PR do?

The torchhub test is failing with a cryptic error. This PR removes the test but keeps the integration intact. As the Hugging Face Hub becomes the main marketplace for `transformers` models, it should be the integration users use and while torchhub remains supported we will not test it going forward.
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_17097). All of your documentation changes will be reflected on that endpoint.<|||||>## 😭😭