Issue #3386233 by yash.rode, cmlara: Returntype incorrect for UnitTestCase::getConfigFactoryStub()

   *   configuration object names and whose values are key => value arrays for

   *   the configuration object in question. Defaults to an empty array.

   *

   * @return \PHPUnit\Framework\MockObject\MockBuilder

   *   A MockBuilder object for the ConfigFactory with the desired return

   *   values.

   * @return \PHPUnit\Framework\MockObject\MockObject|\Drupal\Core\Config\ConfigFactoryInterface

   *   A mock configuration factory object.

   */

  public function getConfigFactoryStub(array $configs = []) {

    $config_get_map = [];