feat(zendesk): add delete user action

packages/backend/src/apps/zendesk/actions/index.ts

@@ -1,6 +1,7 @@
 import createTicket from './create-ticket';
 import createUser from './create-user';
 import deleteTicket from './delete-ticket';
+import deleteUser from './delete-user';
 import findTicket from './find-ticket';
 import updateTicket from './update-ticket';
 
@@ -8,6 +9,7 @@ export default [
   createTicket,
   createUser,
   deleteTicket,
+  deleteUser,
   findTicket,
   updateTicket,
 ];