Hide details of go live request ticket from the user

We put some content in the go live ticket which is for our benefit, for
example notes about the organisation.

It’s hard for us to be able to say what we want here if we know that the
person making a go live request is going to see those notes.

This commit changes go live requests so that the initial content of the
ticket is hidden from the person raising it (in Zendesk it will appear
as an ‘internal note’, rather than a ‘public reply’).

---

Depends on:
- [ ] https://github.com/alphagov/notifications-utils/pull/877/files

app/main/views/service_settings.py

@@ -243,6 +243,7 @@ def submit_request_to_go_live(service_id):
         user_email=current_user.email_address,
         user_name=current_user.name,
         tags=current_service.request_to_go_live_tags,
+        requester_sees_message_content=False,
     )
 
     current_service.update(go_live_user=current_user.id)