[v9] Enable JS SDK native integration by default

[buenaflor]

📜 Description

💡 Motivation and Context

Closes #2634

💚 How did you test it?

Existing tests

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.24%. Comparing base (5ce593b) to head (d7ce527).
Report is 1 commits behind head on v9.

Files with missing lines	Patch %	Lines
flutter/lib/src/sentry_flutter.dart	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v9    #2688      +/-   ##
==========================================
- Coverage   88.31%   88.24%   -0.07%     
==========================================
  Files         262      263       +1     
  Lines        8911     8918       +7     
==========================================
  Hits         7870     7870              
- Misses       1041     1048       +7     

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[denrase]

We still access options.enableSentryJs = true; in the tests

[denrase]

Do we even need this test, as we always enable by default? If not, we can also remove the enabled group.

[buenaflor]

depends, this specifically tests that if autoInitializeNativeSdks = false then we won't init the SDK

I forgot the autoInitializeNativeSdks = false