fix(huggingface): switch integration test provider to together (#35525)

Switch the `TestHuggingFaceEndpoint` serverless inference provider from
`sambanova` to `together` for `Llama-3.3-70B-Instruct`. Sambanova
doesn't support `tool_choice: "any"` (needed by
`test_structured_few_shot_examples` and
`test_unicode_tool_call_integration`) and doesn't return
`usage_metadata` in streaming responses.

libs/partners/huggingface/tests/integration_tests/test_standard.py

@@ -20,7 +20,7 @@ class TestHuggingFaceEndpoint(ChatModelIntegrationTests):
         llm = HuggingFaceEndpoint(  # type: ignore[call-arg]
             repo_id="meta-llama/Llama-3.3-70B-Instruct",
             task="conversational",
-            provider="sambanova",
+            provider="together",
             temperature=0,
         )
         return {"llm": llm}