Since we are pushing for HF repos, we should accept them in inference configs (#497)

# What does this PR do?

As the title says. 

## Test Plan

This needs
8752149f58
to also land. So the next package (0.0.54) will make this work properly.

The test is:

```bash
pytest -v -s -m "llama_3b and meta_reference" test_model_registration.py
```

llama_stack/providers/inline/inference/vllm/config.py

@@ -48,8 +48,11 @@ class VLLMConfig(BaseModel):
     @classmethod
     def validate_model(cls, model: str) -> str:
         permitted_models = supported_inference_models()
-        if model not in permitted_models:
-            model_list = "\n\t".join(permitted_models)
+
+        descriptors = [m.descriptor() for m in permitted_models]
+        repos = [m.huggingface_repo for m in permitted_models]
+        if model not in (descriptors + repos):
+            model_list = "\n\t".join(repos)
             raise ValueError(
                 f"Unknown model: `{model}`. Choose from [\n\t{model_list}\n]"
             )