feat(dataset api): (1.6/n) fix all iterrows callsites (#1660)

# What does this PR do?
- as title

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
CI

```
pytest -v -s --nbval-lax ./docs/notebooks/Llama_Stack_Benchmark_Evals.ipynb
```
<img width="587" alt="image"
src="https://github.com/user-attachments/assets/4a25f493-501e-43f4-9836-d9802223a93a"
/>


[//]: # (## Documentation)

llama_stack/providers/inline/post_training/torchtune/recipes/lora_finetuning_single_device.py

@@ -330,11 +330,11 @@ class LoraFinetuningSingleDevice:
         async def fetch_rows(dataset_id: str):
             return await self.datasetio_api.iterrows(
                 dataset_id=dataset_id,
-                rows_in_page=-1,
+                limit=-1,
             )
 
         all_rows = await fetch_rows(dataset_id)
-        rows = all_rows.rows
+        rows = all_rows.data
 
         await validate_input_dataset_schema(
             datasets_api=self.datasets_api,