$response = new TrustedRedirectResponse('https://google.com');
$form_state->setResponse($response);

/**
* Implements hook_local_tasks_alter().
*/
function EXAMPLE_local_tasks_alter(&$local_tasks) {
 unset($local_tasks['user.register']);
}

$route_name = \Drupal::routeMatch()->getRouteName();

Нужно выполнить

GRANT RELOAD ON *.* TO 'your_user'@'localhost';
FLUSH PRIVILEGES;

$current_path = \Drupal::service('path.current')->getPath();