Fix redirect on first login

[nsklikas]

IAM-1039

The issue is fixed by passing the original return to, to the settings flow. I moved some stuff around, to more clearly separate the responsibilities of the frontend and the backend.

There is some reload happening in the setup_secure page when you get there (you momentarily see the spinning thingy). Not sure how to fix it (@edlerd please have a look)

SInce Natalia is not here this week @edlerd and @BarcoMasile please try it out, as I may have broken something

[lukasSerelis]

Pasting reply on this issue too for UX requirements

It'd be best from UX point of view to add a confirmation screen before the automatic redirect to the application. So the flow should be something like this: Or in screens it would be

1. Trying to sign in for the first time
   
2. Required TOTP setup
   
3. Setup complete, message to confirm that action has been successful (also good place to show any errors if some occur). And automatic redirect within 3 seconds.
   
4. Landing on the 3rd party application page
   

[edlerd]

Mostly looks good, some non-blocking nitpicks and one concern below.

[edlerd]

LGTM, thanks for the fixes!