fix: MAUI eventbinding moved to FinishedLaunching

[bitsandfoxes]

Fixes #2898

So there is nothing really "fixed" here. Putting it in bitwarden just highlighted a potential issue with the SDK.
There the app relies on the FinishedLaunching callback to setup their own service container before instantiating the app. The SDK's call into services causes the app to be instantiated first.
Considering that other applications might be doing the same I think it's fair to move the binding to the FinishedLaunching as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2378822) 75.26% compared to head (0aba6e6) 76.43%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3057      +/-   ##
==========================================
+ Coverage   75.26%   76.43%   +1.17%     
==========================================
  Files         351      351              
  Lines       13257    13262       +5     
  Branches     2645     2646       +1     
==========================================
+ Hits         9978    10137     +159     
+ Misses       2603     2447     -156     
- Partials      676      678       +2     

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