[Bugfix] Skip gs:// model paths for speculator detection (#27846)

Signed-off-by: Peter Schuurman <psch@google.com>

vllm/transformers_utils/utils.py

@@ -19,6 +19,14 @@ def is_s3(model_or_path: str) -> bool:
     return model_or_path.lower().startswith("s3://")
 
 
+def is_gcs(model_or_path: str) -> bool:
+    return model_or_path.lower().startswith("gs://")
+
+
+def is_cloud_storage(model_or_path: str) -> bool:
+    return is_s3(model_or_path) or is_gcs(model_or_path)
+
+
 def check_gguf_file(model: str | PathLike) -> bool:
     """Check if the file is a GGUF model."""
     model = Path(model)