Stop reconnecting SSE after assembly_finished

[kvz]

Summary

• short-circuit SSE processing once assembly_finished arrives and close the EventSource cleanly
• ensure follow-up assembly_error events are ignored after completion, matching expected behaviour
• add unit + integration coverage that reproduces the regression and exercises a live assembly stream

Testing

• ./scripts/test-in-docker.sh test --tests com.transloadit.sdk.EventsourceRunnableTest
• ./scripts/test-in-docker.sh test --tests com.transloadit.sdk.integration.AssemblySseIntegrationTest
• ./scripts/test-in-docker.sh check

[codecov-commenter]

Codecov Report

❌ Patch coverage is 47.36842% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.77%. Comparing base (3a9bcaf) to head (76d4ddd).

Files with missing lines	Patch %	Lines
.../java/com/transloadit/sdk/EventsourceRunnable.java	47.36%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #96      +/-   ##
============================================
- Coverage     77.47%   76.77%   -0.70%     
- Complexity      209      211       +2     
============================================
  Files            13       13              
  Lines           759      775      +16     
  Branches         66       68       +2     
============================================
+ Hits            588      595       +7     
- Misses          137      146       +9     
  Partials         34       34              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.