chore(iOS): UIScene migration

[armanddidierjean]

https://docs.flutter.dev/release/breaking-changes/uiscenedelegate

Description

Summary

Based on ProximApp#140

Classification

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 🔨 Refactor (non-breaking change that neither fixes a bug nor adds a feature)
• 🔧 Infra CI/CD (changes to configs of workflows)
• 💥 BREAKING CHANGE (fix or feature that require a new minimal version of the front-end)
• 😶‍🌫️ No impact for the end-users

Impact & Scope

• Core functionality changes
• Single module changes
• Multiple modules changes
• Other: ...

Testing

• 1. Tested this locally
• 2. Added/modified tests that pass the CI (or tested in a downstream fork)
• 3. Tested in a local client using a pre-prod backend
• 0. Untestable (exceptionally), will be tested in prod directly

Documentation

• Updated the docs accordingly :
• // Comments
• No documentation needed

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.98%. Comparing base (a34d066) to head (ab8e5a7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #705   +/-   ##
=======================================
  Coverage   50.98%   50.98%           
=======================================
  Files         168      168           
  Lines        3789     3789           
=======================================
  Hits         1932     1932           
  Misses       1857     1857           

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