Avatar picture link

[RakanHowls]

It would be "nice to have", if the avatar picture link from the IDP could be forwarded in the frontend-userinfo API.

[Jumpy-Squirrel]

This would only work for the currently logged in attendee.

Might be better to cache the last seen value of this information in the attendee service, just like the identity is cached.

See eurofurence/reg-attendee-service#240