[Test] Skip the qwen3-omni relevant validation for a known issue 1367. (#1812)

Signed-off-by: yenuo26 <410167048@qq.com>

tests/e2e/online_serving/test_qwen3_omni.py

@@ -118,7 +118,6 @@ def test_mix_to_text_audio_001(omni_server, openai_client) -> None:
         "stream": True,
         "key_words": {
             "audio": ["test"],
-            "image": ["square", "quadrate"],
         },
     }