Fixed SSE connection not closing when an exception is thrown

[sunghwan2789]

Closes #6698

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.78%. Comparing base (00b4fdf) to head (6f2aad0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7007      +/-   ##
==========================================
- Coverage   72.73%   69.78%   -2.95%     
==========================================
  Files        2599     2567      -32     
  Lines      129629   128287    -1342     
==========================================
- Hits        94284    89529    -4755     
- Misses      35345    38758    +3413     

Flag	Coverage Δ
unittests	69.78% <100.00%> (-2.95%)	⬇️

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[michaelstaib]

We have completely reworked the formatter here:
#6981

[michaelstaib]

We cannot merge this one as we already have a PR with a new version of this.

[sunghwan2789]

We cannot merge this one as we already have a PR with a new version of this.

Are you merging #6981 into v13? If not, I can change the base