[BUGFIX] Properly soft-delete scheduler task groups

Use update() over delete() to set hidden
field to 1 to soft-delete instead of
completely removing the row from DB

Resolves: #100251
Related: #99874
Releases: main
Change-Id: I8bc8a8c26e3f1918f253019604b7131eafa7e961
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78210
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>

typo3/sysext/scheduler/Classes/Controller/SchedulerModuleController.php

@@ -1064,7 +1064,7 @@ private function getGroupsWithoutTasks(array $taskGroupsWithTasks): array
     private function groupRemove(int $groupId): int
     {
         $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('tx_scheduler_task_group');
-        return $queryBuilder->delete('tx_scheduler_task_group')
+        return $queryBuilder->update('tx_scheduler_task_group')
             ->where($queryBuilder->expr()->eq('uid', $groupId))
             ->set('deleted', 1)
             ->executeStatement();