Issue #3387560 by Spokje, smustgrave: Returntype incorrect for \Drupal\Core\Entity\EntityDeleteMultipleAccessCheck::$tempStore

Issue #2886622 by Berdir, martin107, Mile23, tim.plunkett, mikelutz, jonathan1055: Deprecate all EntityManager methods with E_USER_DEPRECATED

Issue #3029199 by Gábor Hojtsy, alexpott: [symfony 5] Calling "Symfony\Component\HttpFoundation\Request::getSession()" when no session has been set is deprecated since Symfony 4.1

Issue #2670730 by chr.fritsch, robpowell, alexpott, tstoeckler, Berdir, bojanz, dawehner: Provide a delete action for each content entity type