(improvement) OTP login flow

[alexstotsky]

Task: https://app.asana.com/0/1163495710802945/1206749632170616/f

Description:

• Prevents the potential possibility of duplicated sending for correct OTP in the following scenario:

- after setting correct google auth key
- makes auto request (without pushing btn)
- then we get a response and enable auth btn (as proposed before)
- and have a delay until the full app launch
- and here the btn is not blocked and the user can potentially send the second otp request 
with the same google token

Solution: we should keep btn disabled until the successful auth will be completed

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Depends on:

• bfx-report-ui #776

[ezewer]

lgtm!