Part of ["Secure Logins in EChat"](https://github.com/Expensify/Expensify/issues/280523) project Section of doc: [Only Revealing Data to Known Users](https://docs.google.com/document/d/1G1rjhsPT1S_9BEw7yFvwUcw8AQih0yBANPPPpiKzYlk/edit#heading=h.w8k7lnkrzpty) Goals: 1. Flagging Unknown Users in Auth 2. Updating Personal Details Object in Web 3. Stop sending public room personal details unnecessarily