task: #3582666 Remove Drupal\layout_discovery\Install\Requirements\LayoutDiscoveryRequirements

<?php

declare(strict_types=1);

namespace Drupal\layout_discovery\Install\Requirements;

use Drupal\Core\Extension\InstallRequirementsInterface;

use Drupal\Core\Extension\Requirement\RequirementSeverity;

/**

 * Install time requirements for the layout_discovery module.

 */

class LayoutDiscoveryRequirements implements InstallRequirementsInterface {

  /**

   * {@inheritdoc}

   */

  public static function getRequirements(): array {

    $requirements = [];

    if (\Drupal::moduleHandler()->moduleExists('layout_plugin')) {

      $requirements['layout_discovery'] = [

        'description' => t('Layout Discovery cannot be installed because the Layout Plugin module is installed and incompatible.'),

        'severity' => RequirementSeverity::Error,

      ];

    }

    return $requirements;

  }

}