test: verification on provider's OAI endpoints (#1893)

# What does this PR do?


## Test Plan
export MODEL=accounts/fireworks/models/llama4-scout-instruct-basic;
LLAMA_STACK_CONFIG=verification pytest -s -v tests/integration/inference
--vision-model $MODEL --text-model $MODEL

llama_stack/providers/remote/inference/together/together.py

@@ -118,7 +118,7 @@ class TogetherInferenceAdapter(ModelRegistryHelper, Inference, NeedsRequestProvi
 
     async def _stream_completion(self, request: CompletionRequest) -> AsyncGenerator:
         params = await self._get_params(request)
-        client = await self._get_client()
+        client = self._get_client()
         stream = await client.completions.create(**params)
         async for chunk in process_completion_stream_response(stream):
             yield chunk