As a participant, given that I have registered for an event,
I want to change my registration from public to private (and vice versa)
so that I can control who is able to see my username in the participant list.
We will implement this as a first increment to editing participant questions T323821, because this is a smaller task that will allow us to implement the general "edit registration" logic without all the complexity coming from the participant questions epic.
Acceptance criteria
- Participant can edit their registration from public to private using Special:RegisterForEvent
- Participant can edit their registration from public to private using the event page dialog
- Participant can edit their registration from private to public using Special:RegisterForEvent
- Participant can edit their registration from private to public using the event page dialog

















