[native] Upload secondary device keys when added to list

Summary:
After receiving information from primary device about successful device list update, secondary device should perform device keys upload. Then it should be able to start normal authenticated Tunnelbroker session.

Depends on D11294

Test Plan: Repeated test plan from D11294, and also made sure the secondary device keys have been uploaded. Monitored the isAuthorized Tunnelbroker prop - after successful RPC call, it switched to true.

Reviewers: kamil, michal

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11295