Lighter smoke tests

[bkorycki]

This is for card 974: Refactor smoke tests to include only one SUT per provider and only serverless

• Only include one SUT per class. SUT classes roughly correspond to providers, but some providers have multiple SUT classes (e.g. for different endpoints/apis).
• Skip SUTs that belong to non-serverless classes ($$). Right now this just includes huggingface inference and baseten.
  • This now requires you to have specific plugins installed to run the validation tests due to imports of class names. It will break without those plugins installed. Maybe this is undesirable?

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[wpietri]

I think ideally we'd include one cheap item each for the expensive providers. But we can leave that until one of those providers breaks on us.