feat: Fetch groups in batch in getUserGroups

Signed-off-by: Carl Schwan <carlschwan@kde.org>

Author: CarlSchwan

lib/private/Group/Manager.php

@@ -312,13 +312,10 @@ public function getUserGroups(?IUser $user = null): array {
 	public function getUserIdGroups(string $uid): array {
 		$groups = [];
 
-		foreach ($this->getUserIdGroupIds($uid) as $groupId) {
-			$aGroup = $this->get($groupId);
-			if ($aGroup instanceof IGroup) {
-				$groups[$groupId] = $aGroup;
-			} else {
-				$this->logger->debug('User "' . $uid . '" belongs to deleted group: "' . $groupId . '"', ['app' => 'core']);
-			}
+		$groupIds = $this->getUserIdGroupIds($uid);
+		$newGroups = $this->getGroupsObjects($groupIds);
+		foreach ($newGroups as $groupId => $group) {
+			$groups[$groupId] = $group;
 		}
 
 		return $groups;