As a follow-up to T316294, if the viewer is a sufficiently privileged user (e.g., a steward), they should be able to see suppressed usernames. Given how core's CentralIdLookup is designed, we should do this by passing the current user as $audience to the relevant methods, that would handle visibility/permission checks for us.
Acceptance criteria
- Suppressed usernames are shown to privileged users (e.g., stewards) after "Organized by" on event pages