[Facebook] Event hosts/co-hosts disclose for Pages

 When a page creates an event and adds another page as a co-host, the admins of creator page and co-host page admins will disclose each other if they attend the event.

POC -

A Page creates an Event and adds another Page as the Co-Host of that Event.

Both Page owners as Personal Profile have set the SVRP to "Going"(or one of them).

If both these Pages try to remove a specific Personal User Profile(or one of them) from the Event, an error will pop up saying "Failed to remove admin".

Timeline -

Reported - Tuesday, January 29, 2019

Triaged - Friday, February 1, 2019 

Fixed - Thursday, March 21, 2019

Rewarded - Wednesday, March 27, 2019

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