Fix SSE formatter error that will cause server slow down.

[michaelstaib]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 46.93878% with 52 lines in your changes missing coverage. Please review.

Project coverage is 77.63%. Comparing base (a350ce1) to head (d0ea022).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...cution/Serialization/EventStreamResultFormatter.cs	57.81%	27 Missing ⚠️
...alization/EventStreamResultFormatterEventSource.cs	19.35%	25 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7401      +/-   ##
==========================================
- Coverage   78.90%   77.63%   -1.27%     
==========================================
  Files        2433     2814     +381     
  Lines      119802   141011   +21209     
==========================================
+ Hits        94530   109477   +14947     
- Misses      25272    31534    +6262     

Flag	Coverage Δ
unittests	77.63% <46.93%> (-1.27%)	⬇️

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