fix: The last "Authorise" button on the onboarding now working

[g123k]

Hi everyone!

The "Authorise" button in the Consent screen (on the onboarding) was visually broken.
Actually, the build method of the "real" Homepage was called… but never displayed.

The main issue is that the onboarding is mixing Navigator v1 and v2 calls.
Thus, the onboarding is considered as the "/" route, which is the same as the "real" homepage.

The trick is to have a difference between the two screens + manually clear the stack.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 6.94%. Comparing base (4d9c7fc) to head (f64852a).
Report is 379 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ib/pages/onboarding/onboarding_flow_navigator.dart	0.00%	8 Missing ⚠️
.../smooth_app/lib/pages/navigator/app_navigator.dart	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5723      +/-   ##
==========================================
- Coverage     9.54%   6.94%   -2.60%     
==========================================
  Files          325     404      +79     
  Lines        16411   21615    +5204     
==========================================
- Hits          1567    1502      -65     
- Misses       14844   20113    +5269     

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