[TASK] truncate() cascade with non-mysql platforms (#684)

When truncating tables with foreign key constraints, postgres
may deny truncation. Hand over an argument to doctrine to
force table truncation by cascading into other tables if needed.

Author: lleicher-sg

Classes/Core/Testbase.php

@@ -869,7 +869,7 @@ private function truncateAllTablesForOtherDatabases(): void
 
         $schemaManager = $connection->createSchemaManager();
         foreach ($schemaManager->listTables() as $table) {
-            $connection->truncate($table->getName());
+            $connection->truncate($table->getName(), true);
             self::resetTableSequences($connection, $table->getName());
         }
     }