Add SSE regression coverage for assembly_finished ordering

[kvz]

Summary

• add an SSE regression test that replays the existing fixture but reorders assembly_finished ahead of the second result to emulate the Android parity scenario
• adjust legacy SSE assertions to tolerate duplicate events triggered by LaunchDarkly reconnects
• keep the event loop draining after assembly_finished for a short grace period so late result events are observed

Testing

• ./scripts/test-in-docker.sh check

[codecov-commenter]

Codecov Report

❌ Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.37%. Comparing base (d7bb207) to head (213227d).

Files with missing lines	Patch %	Lines
.../java/com/transloadit/sdk/EventsourceRunnable.java	20.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #98      +/-   ##
============================================
+ Coverage     75.81%   76.37%   +0.55%     
- Complexity      212      217       +5     
============================================
  Files            13       13              
  Lines           794      800       +6     
  Branches         72       75       +3     
============================================
+ Hits            602      611       +9     
+ Misses          155      153       -2     
+ Partials         37       36       -1     

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