Add EXTERNAL_USE_SCHEMA attribute to catalog dataclasses

Author: jijosg

docs/dbdataclasses/catalog.rst

@@ -1169,6 +1169,9 @@ These dataclasses are used in the SDK to represent API requests and responses fo
 
    .. py:attribute:: EXECUTE_CLEAN_ROOM_TASK
       :value: "EXECUTE_CLEAN_ROOM_TASK"
+   
+   .. py:attribute:: EXTERNAL_USE_SCHEMA
+      :value: "EXTERNAL_USE_SCHEMA"
 
    .. py:attribute:: MANAGE
       :value: "MANAGE"