[TASK] Remove legacy code and switch to symfony command

Classes/Command/MigrateNewsCommandController.php

Classes/Controller/AbstractController.php

Classes/Controller/BackendController.php

Classes/Hooks/PageLayoutController.php

Classes/Service/LicensingService.php

Classes/Updates/MigrateSchedulerTasks.php

Classes/Utility/BackendNewsUtility.php

Classes/Utility/ExtensionUtility.php

Classes/ViewHelpers/Backend/ControlViewHelper.php

Classes/ViewHelpers/Backend/TranslationLinksViewHelper.php

Configuration/Commands.php

Configuration/TCA/Overrides/pages.php

Configuration/TCA/Overrides/pages_language_overlay.php

Configuration/TCA/tx_sgnews_domain_model_author.php

ext_localconf.php

ext_tables.php