add parent mailing group type and remove redundant $options from Option Group Type

Add the Parent Mailing Group Type (and remove unnecessary $options in OptionGroupType)

Civi/FormProcessor/Type/ParentMailingGroupType.php

@@ -17,11 +17,6 @@ use \CRM_FormProcessor_ExtensionUtil as E;
 class ParentMailingGroupType extends AbstractType implements OptionListInterface {
 
   private $_childGroups;
-
-  private $_normalizedOptions;
-
-  private $_denormalizedOptions;
-
   private $_groupsLoaded = FALSE;
 
   /**