Fix: Scope#clone calls the Native bridges again via the scopeObserver

[denrase]

📜 Description

Closes #926

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

[codecov-commenter]

Codecov Report

Merging #959 (0f1cc2d) into main (7011abe) will decrease coverage by 0.02%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #959      +/-   ##
==========================================
- Coverage   89.52%   89.49%   -0.03%     
==========================================
  Files         105      105              
  Lines        3292     3303      +11     
==========================================
+ Hits         2947     2956       +9     
- Misses        345      347       +2     

Impacted Files	Coverage Δ
dart/lib/src/hub_adapter.dart	10.52% <0.00%> (-0.29%)	⬇️
dart/lib/src/noop_hub.dart	20.68% <ø> (ø)
dart/lib/src/sentry.dart	84.72% <0.00%> (ø)
dart/lib/src/hub.dart	80.48% <33.33%> (ø)
dart/lib/src/scope.dart	95.05% <86.95%> (-0.30%)	⬇️

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[marandaneto]

@denrase did that cause duplicated breadcrumbs or is it still just an improvement?

[denrase]

@marandaneto Did not try to reproduce duplication here. Basically i assumed that calling the observers is unwanted behaviour as described in the issue and therefore marked this as fix.