[native] Update device list on QR code scaned

Summary:
Part of QR code auth flow - primary device performs device list update after the QR code is scanned. Then it notifies the secondary device that it can continue.

Depends on D11293

Test Plan: Ran the app on both simulator and physical phone - scanned QR code and made sure that Identity Service receives updated device list (checked the DDB table)

Reviewers: kamil, michal

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11294