fix test_blob_image_resize* and test_blob_image_normalize*

Author: shuoweil

bigframes/operations/blob.py

@@ -489,7 +489,12 @@ def image_blur(
                 ops.JSONValue(json_path="$.status")
             )
             results_df = bpd.DataFrame(
-                {"status": blurred_status_series, "content": dst}
+                {
+                    "status": blurred_status_series,
+                    "content": dst.blob.uri().str.to_blob(
+                        connection=self._resolve_connection(connection)
+                    ),
+                }
             )
             results_struct = bbq.struct(results_df).rename("blurred_results")
             return results_struct
@@ -623,7 +628,12 @@ def image_resize(
                 ops.JSONValue(json_path="$.status")
             )
             results_df = bpd.DataFrame(
-                {"status": resized_status_series, "content": dst}
+                {
+                    "status": resized_status_series,
+                    "content": dst.blob.uri().str.to_blob(
+                        connection=self._resolve_connection(connection)
+                    ),
+                }
             )
             results_struct = bbq.struct(results_df).rename("resized_results")
             return results_struct
@@ -753,7 +763,9 @@ def image_normalize(
             results_df = bpd.DataFrame(
                 {
                     "status": normalized_status_series,
-                    "content": dst,
+                    "content": dst.blob.uri().str.to_blob(
+                        connection=self._resolve_connection(connection)
+                    ),
                 }
             )
             results_struct = bbq.struct(results_df).rename("normalized_results")