making _run_multi_threaded static

Author: verayu43

src/sagemaker/feature_store/feature_group.py

@@ -302,9 +302,9 @@ def init_worker():
 
         if wait:
             self.wait(timeout=timeout)
-
+            
+    @staticmethod
     def _run_multi_threaded(
-        self,
         max_workers: int,
         feature_group_name: str,
         sagemaker_fs_runtime_client_config: Config,