test: Use initialScope in sample apps

[philipphofmann]

Related PR #2982.

#skip-changelog

[codecov]

Codecov Report

Merging #3001 (6f8b367) into main (2b4a663) will increase coverage by 0.012%.
The diff coverage is 77.777%.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3001       +/-   ##
=============================================
+ Coverage   88.287%   88.299%   +0.012%     
=============================================
  Files          495       495               
  Lines        53249     53254        +5     
  Branches     19129     19127        -2     
=============================================
+ Hits         47012     47023       +11     
+ Misses        5272      5268        -4     
+ Partials       965       963        -2     

Impacted Files	Coverage Δ
Tests/SentryTests/SentryOptionsTest.m	97.535% <71.428%> (-0.110%)	⬇️
Sources/Sentry/SentrySDK.m	90.222% <100.000%> (+0.043%)	⬆️

... and 7 files with indirect coverage changes

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