Fix: Do not append threads that come from the EnvelopeFileObserver

[marandaneto]

📜 Description

Fix: Do not append threads that come from the EnvelopeFileObserver

💡 Motivation and Context

Fix #1473

💚 How did you test it?

📝 Checklist

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

🔮 Next steps

[codecov-commenter]

Codecov Report

Merging #1501 (63bf9cd) into main (dbc59e2) will increase coverage by 0.03%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##               main    #1501      +/-   ##
============================================
+ Coverage     76.00%   76.03%   +0.03%     
- Complexity     1924     1926       +2     
============================================
  Files           191      191              
  Lines          6664     6665       +1     
  Branches        663      663              
============================================
+ Hits           5065     5068       +3     
+ Misses         1274     1273       -1     
+ Partials        325      324       -1     

Impacted Files	Coverage Δ
...ry/src/main/java/io/sentry/MainEventProcessor.java	83.33% <66.66%> (+0.16%)	⬆️
...n/java/io/sentry/transport/ReusableCountLatch.java	94.11% <0.00%> (+5.88%)	⬆️

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