feat: add endpoint to export saved queries using new format (#11447)

* Add UUID to saved_query

* Reuse function from previous migration

* Point to new head

* feat: add backend to export saved queries using new format

superset/models/sql_lab.py

@@ -188,7 +188,6 @@ class SavedQuery(Model, AuditMixinNullable, ExtraJSONMixin, ImportMixin):
 
     export_parent = "database"
     export_fields = [
-        "db_id",
         "schema",
         "label",
         "description",