Clean up EE overrides

ee/app/controllers/ee/registrations_controller.rb

@@ -5,8 +5,6 @@ module EE
     private
 
     def sign_up_params
-      raise NotImplementedError unless defined?(super)
-
       clean_params = params.require(:user).permit(:username, :email, :email_confirmation, :name, :password, :email_opted_in)
 
       if clean_params[:email_opted_in] == '1'

ee/app/services/ee/system_hooks_service.rb

@@ -5,15 +5,7 @@ module EE
     private
 
     def user_data(model)
-      raise NotImplementedError unless defined?(super)
-
-      data = {
-        name: model.name,
-        email: model.email,
-        user_id: model.id,
-        username: model.username
-      }
-
+      data = super
       data.merge!(email_opted_in_data(model)) if ::Gitlab.com?
       data
     end

ee/app/services/ee/users/build_service.rb

@@ -4,13 +4,11 @@ module EE
       private
 
       def signup_params
+        super + email_opted_in_params
+      end
+
+      def email_opted_in_params
         [
-          :email,
-          :email_confirmation,
-          :password_automatically_set,
-          :name,
-          :password,
-          :username,
           :email_opted_in,
           :email_opted_in_ip,
           :email_opted_in_source_id,