Issue #3087546 by Berdir, alexpott, martin107, jibran: Remove deprecated entity manager

core/core.api.php

core/core.services.yml

core/includes/entity.inc

core/includes/install.core.inc

core/lib/Drupal.php

core/lib/Drupal/Core/Action/Plugin/Action/EmailAction.php

core/lib/Drupal/Core/Config/ConfigManager.php

core/lib/Drupal/Core/Config/ConfigManagerInterface.php

core/lib/Drupal/Core/Controller/ControllerBase.php

core/lib/Drupal/Core/DrupalKernel.php

core/lib/Drupal/Core/Entity/ContentEntityForm.php

core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php

core/lib/Drupal/Core/Entity/ContentUninstallValidator.php

core/lib/Drupal/Core/Entity/Controller/EntityController.php

...ib/Drupal/Core/Entity/Controller/EntityViewController.php

core/lib/Drupal/Core/Entity/Entity/EntityViewMode.php

core/lib/Drupal/Core/Entity/EntityBase.php

core/lib/Drupal/Core/Entity/EntityCreateAccessCheck.php

.../lib/Drupal/Core/Entity/EntityDefinitionUpdateManager.php

...al/Core/Entity/EntityDefinitionUpdateManagerInterface.php