Synchronize platform details with identity on app start

Summary: This differential ensures automatic platofrm details updates on both clients.

Test Plan: Repeat test plan for parent diff but but this time don't call anything from JS. It should be done automatically.

Reviewers: kamil, bartek

Reviewed By: bartek

Subscribers: varun, ashoat, tomek

Differential Revision: https://phab.comm.dev/D12312