TestActionConfirmForm.php

<?php

namespace Drupal\action_bulk_test\Form;

use Drupal\Component\Render\MarkupInterface;
use Drupal\Core\Form\ConfirmFormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

/**
 * Confirmation form for 'test_action' action.
 */
class TestActionConfirmForm extends ConfirmFormBase {

  /**
   * {@inheritdoc}
   */
  public function getFormId() : string {
    return 'test_action_confirm_form';
  }

  /**
   * {@inheritdoc}
   */
  public function getCancelUrl() : Url {
    return Url::fromRoute('<front>');
  }

  /**
   * {@inheritdoc}
   */
  public function getQuestion() : MarkupInterface {
    return $this
      ->t('Do you agree?');
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) : void {
  }

}