fix:disabling going back function on connectionless proof flow

[CarolineLCa]

Summary of Changes

Disabling going back function on connectionless proof flow.

Expected behavior

Users should not exit this screen using the device's back button, just the home icon.

Actual behavior

Users can go back and on android it shows up a black screen, on iOS returns to the scan screen.

To fix

I added gestureEnabled for ios (didn't work on android) and Backhandler API for android, both already used in the project.
https://reactnavigation.org/docs/stack-navigator/#gestureenabled
https://reactnative.dev/docs/backhandler

Screen_Recording_20231226_170053_Aries.Bifold.mp4

Related Issues

N/A

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (279599d) 61.48% compared to head (d1fca64) 61.50%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1051      +/-   ##
==========================================
+ Coverage   61.48%   61.50%   +0.02%     
==========================================
  Files         170      170              
  Lines        5450     5453       +3     
  Branches     1570     1570              
==========================================
+ Hits         3351     3354       +3     
  Misses       2075     2075              
  Partials       24       24              

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[thiagoromanos]

Tested here (both Android and iOS). It's working fine.