task: #3627134 Delete WorkspacesRequirements

<?php

declare(strict_types=1);

namespace Drupal\workspaces\Install\Requirements;

use Drupal\Core\Extension\InstallRequirementsInterface;

use Drupal\Core\Extension\Requirement\RequirementSeverity;

/**

 * Install time requirements for the workspaces module.

 */

class WorkspacesRequirements implements InstallRequirementsInterface {

  /**

   * {@inheritdoc}

   */

  public static function getRequirements(): array {

    $requirements = [];

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

      $requirements['workspace_incompatibility'] = [

        'severity' => RequirementSeverity::Error,

        'description' => t('Workspaces can not be installed when the contributed Workspace module is also installed. See the <a href=":link">upgrade path</a> page for more information on how to upgrade.', [

          ':link' => 'https://www.drupal.org/node/2987783',

        ]),

      ];

    }

    return $requirements;

  }

}