Fix: captureTransaction should return emptyId when transaction is discarded

[marandaneto]

📜 Description

Fix: captureTransaction should return emptyId when transaction is discarded

💡 Motivation and Context

Fix #712

💚 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

🔮 Next steps

[brustolin]

LGTM

[codecov-commenter]

Codecov Report

Merging #713 (00ccde1) into main (ea5c733) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #713   +/-   ##
=======================================
  Coverage   90.70%   90.70%           
=======================================
  Files         104      104           
  Lines        3335     3336    +1     
=======================================
+ Hits         3025     3026    +1     
  Misses        310      310           

Impacted Files	Coverage Δ
dart/lib/src/sentry_client.dart	94.00% <0.00%> (+0.06%)	⬆️

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