fix: fix read_gbq_function issue in dataframe apply method

bigframes/dataframe.py

@@ -3674,7 +3674,11 @@ def apply(self, func, *, axis=0, args: typing.Tuple = (), **kwargs):
             return result_series
 
         # Per-column apply
-        results = {name: func(col, *args, **kwargs) for name, col in self.items()}
+        if hasattr(func, "bigframes_remote_function"):
+            results = {name: col.apply(func) for name, col in self.items()}
+        else:
+            results = {name: func(col, *args, **kwargs) for name, col in self.items()}
+
         if all(
             [
                 isinstance(val, bigframes.series.Series) or utils.is_list_like(val)