explicitly deprecate quick_form_type
Per @eileen: https://github.com/civicrm/civicrm-core/pull/19629#issuecomment-782931663 "I think the comment is a deprecation of sorts but could be more explicit"
Per @eileen: https://github.com/civicrm/civicrm-core/pull/19629#issuecomment-782931663 "I think the comment is a deprecation of sorts but could be more explicit"