Add Preview namespace to EE extension so Rails

could find it better?

app/mailers/previews/notify_preview.rb

 class NotifyPreview < ActionMailer::Preview
-  prepend EE::NotifyPreview
+  prepend EE::Preview::NotifyPreview
 
   def note_merge_request_email_for_individual_note
     note_email(:note_merge_request_email) do

ee/app/mailers/ee/preview/notify_preview.rb

 module EE
-  module NotifyPreview
-    extend ActiveSupport::Concern
-
-    # We need to define the methods on the prepender directly because:
-    # https://github.com/rails/rails/blob/3faf7485623da55215d6d7f3dcb2eed92c59c699/actionmailer/lib/action_mailer/preview.rb#L73
-    prepended do
-      def add_merge_request_approver_email
-        Notify.add_merge_request_approver_email(user.id, merge_request.id, user.id).message
-      end
+  module Preview
+    module NotifyPreview
+      extend ActiveSupport::Concern
+
+      # We need to define the methods on the prepender directly because:
+      # https://github.com/rails/rails/blob/3faf7485623da55215d6d7f3dcb2eed92c59c699/actionmailer/lib/action_mailer/preview.rb#L73
+      prepended do
+        def add_merge_request_approver_email
+          Notify.add_merge_request_approver_email(user.id, merge_request.id, user.id).message
+        end
 
-      def issues_csv_email
-        Notify.issues_csv_email(user, project, '1997,Ford,E350', { truncated: false, rows_expected: 3, rows_written: 3 }).message
-      end
+        def issues_csv_email
+          Notify.issues_csv_email(user, project, '1997,Ford,E350', { truncated: false, rows_expected: 3, rows_written: 3 }).message
+        end
 
-      def approved_merge_request_email
-        Notify.approved_merge_request_email(user.id, merge_request.id, approver.id).message
-      end
+        def approved_merge_request_email
+          Notify.approved_merge_request_email(user.id, merge_request.id, approver.id).message
+        end
 
-      def unapproved_merge_request_email
-        Notify.unapproved_merge_request_email(user.id, merge_request.id, approver.id).message
-      end
+        def unapproved_merge_request_email
+          Notify.unapproved_merge_request_email(user.id, merge_request.id, approver.id).message
+        end
 
-      def mirror_was_hard_failed_email
-        Notify.mirror_was_hard_failed_email(project.id, user.id).message
-      end
+        def mirror_was_hard_failed_email
+          Notify.mirror_was_hard_failed_email(project.id, user.id).message
+        end
 
-      def project_mirror_user_changed_email
-        Notify.project_mirror_user_changed_email(user.id, 'deleted_user_name', project.id).message
-      end
+        def project_mirror_user_changed_email
+          Notify.project_mirror_user_changed_email(user.id, 'deleted_user_name', project.id).message
+        end
 
-      def send_admin_notification
-        Notify.send_admin_notification(user.id, 'Email subject from admin', 'Email body from admin').message
-      end
+        def send_admin_notification
+          Notify.send_admin_notification(user.id, 'Email subject from admin', 'Email body from admin').message
+        end
 
-      def send_unsubscribed_notification
-        Notify.send_unsubscribed_notification(user.id).message
-      end
+        def send_unsubscribed_notification
+          Notify.send_unsubscribed_notification(user.id).message
+        end
 
-      def service_desk_new_note_email
-        cleanup do
-          note = create_note(noteable_type: 'Issue', noteable_id: issue.id, note: 'Issue note content')
+        def service_desk_new_note_email
+          cleanup do
+            note = create_note(noteable_type: 'Issue', noteable_id: issue.id, note: 'Issue note content')
 
-          Notify.service_desk_new_note_email(issue.id, note.id).message
+            Notify.service_desk_new_note_email(issue.id, note.id).message
+          end
         end
-      end
 
-      def service_desk_thank_you_email
-        Notify.service_desk_thank_you_email(issue.id).message
+        def service_desk_thank_you_email
+          Notify.service_desk_thank_you_email(issue.id).message
+        end
       end
-    end
 
-    private
+      private
 
-    def approver
-      @user ||= User.first
+      def approver
+        @user ||= User.first
+      end
     end
   end
 end