updated test to mark as potential failure

Author: nnshah1

src/c++/perf_analyzer/genai-perf/tests/test_llm_inputs.py

@@ -184,6 +184,10 @@ def test_convert_default_json_to_pa_format(self, default_configured_url):
         assert pa_json is not None
         assert len(pa_json["data"]) == LlmInputs.DEFAULT_LENGTH
 
+    @pytest.mark.xfail(
+        reason="Download from huggingface may fail due to server issues",
+        raises=GenAIPerfException,
+    )
     def test_create_openai_llm_inputs_cnn_dailymail(self):
         """
         Test CNN_DAILYMAIL can be accessed