kill sample providers, update tests thanks Eric, then fix all configs

llama_stack/providers/inline/post_training/torchtune/config.py

@@ -4,7 +4,7 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-from typing import Literal, Optional
+from typing import Any, Dict, Literal, Optional
 
 from pydantic import BaseModel
 
@@ -12,3 +12,9 @@ from pydantic import BaseModel
 class TorchtunePostTrainingConfig(BaseModel):
     torch_seed: Optional[int] = None
     checkpoint_format: Optional[Literal["meta", "huggingface"]] = "meta"
+
+    @classmethod
+    def sample_run_config(cls, __distro_dir__: str, **kwargs: Any) -> Dict[str, Any]:
+        return {
+            "checkpoint_format": "meta",
+        }