fixup! Add objects-user fixture and cleanup

Author: gaudenz

api.py

@@ -191,7 +191,7 @@ def cleanup(self, limit_to_scope=True, limit_to_process=True):
             raise ExceptionGroup("Failures during cleanup.", exceptions)
 
     def objects_endpoint_for(self, zone):
-        return self.objects_url.format(region=zone.rstrip('012345679'))
+        return self.objects_url.format(region=zone.rstrip('0123456789'))
 
 
 def delete_handler(path):