code: def delete_variable_group(self, project, group_id):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          if group_id is not None:
              route_values['groupId'] = self._serialize.url('group_id', group_id, 'int')
          self._send(http_method='DELETE',
                     location_id='f5b09dd5-9d54-45a1-8b5a-1c8287d634cc',
                     version='5.1-preview.1',
                     route_values=route_values)
docs: DeleteVariableGroup.
          [Preview API] Delete a variable group
          :param str project: Project ID or project name
          :param int group_id: Id of the variable group.