Remove all event listeners symfony 4.4

        /** @var ContainerAwareEventManager $evm */
        $evm = $em->getEventManager();
        foreach ($evm->getListeners() as $event => $listeners) {
            foreach ($listeners as $key => $listener) {
                if (str_starts_with($key, '_service_')) {
                    $listener = substr($key, strlen('_service_') );
                }
                $evm->removeEventListener([$event], $listener);
            }
        }