[Tunnelbroker] implement errors from FCM service

Summary:
Implementing response status described in Error codes for FCM failure conditions.

There is no error about an invalid device token, created: ENG-8824.

Depends on D12767

Test Plan: cargo check

Reviewers: bartek, marcin

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D12768