Added Group 2.x support with BC for Group 1.x.

Closes #3306677

src/Entity/QuickNodeCloneEntityFormBuilder.php

@@ -14,7 +14,6 @@ use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Drupal\Core\StringTranslation\TranslationInterface;
 use Drupal\Core\TempStore\PrivateTempStoreFactory;
-use Drupal\group\Entity\GroupContent;
 use Drupal\node\Entity\Node;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -136,7 +135,7 @@ class QuickNodeCloneEntityFormBuilder extends EntityFormBuilder {
     $groups = [];
     if ($this->moduleHandler->moduleExists('gnode')) {
       /** @var \Drupal\Core\Entity\ContentEntityInterface $original_entity */
-      $group_contents = GroupContent::loadByEntity($original_entity);
+      $group_contents = $this->entityTypeManager->getStorage('group_content')->loadByEntity($original_entity);
       foreach ($group_contents as $group_content) {
         $groups[] = $group_content->getGroup();
       }