fix: initWithPlatforms not sending events if beforeSend is not set on iOS

[buenaflor]

📜 Description

initWithPlatforms doesn't work currently on iOS

💡 Motivation and Context

Fixes #307

💚 How did you test it?

📝 Checklist

You have to check all boxes before merging:

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.

🔮 Next steps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.87%. Comparing base (90c25c6) to head (87b72da).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #366   +/-   ##
=======================================
  Coverage   79.87%   79.87%           
=======================================
  Files          44       44           
  Lines         810      810           
  Branches      108      108           
=======================================
  Hits          647      647           
  Misses        107      107           
  Partials       56       56           

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