Remove the Mailing Forward feature

CRM/Contact/Form/Search.php

CRM/Core/SelectValues.php

CRM/Mailing/BAO/Mailing.php

CRM/Mailing/BAO/Query.php

CRM/Mailing/Event/BAO/Forward.php

CRM/Mailing/Event/BAO/MailingEventForward.php

CRM/Mailing/Event/DAO/Forward.php

CRM/Mailing/Event/DAO/MailingEventForward.php

CRM/Mailing/Form/ForwardMailing.php

CRM/Mailing/Selector/Event.php

CRM/Mailing/xml/Menu/Mailing.xml

CRM/Report/Form/Mailing/Detail.php

CRM/SMS/Form/Upload.php

CRM/Utils/Check/Component/Timestamps.php

CRM/Utils/Token.php

api/v3/Mailing.php

ext/civi_mail/Civi/Api4/MailingEventForward.php

ext/civi_mail/ang/crmMailing/services.js

schema/Mailing/MailingEventForward.entityType.php

sql/civicrm_generated.mysql