Implementing response status described in [Error codes for FCM failure conditions](https://firebase.google.com/docs/reference/fcm/rest/v1/ErrorCode).
There is no error about an invalid device token, created: [ENG-8824](https://linear.app/comm/issue/ENG-8824/biggest-risk-detecting-invalid-device-token-error-from-fcm).
Depends on D12767