Fix sse message corruption

[sunghwan2789]

and possible memory leak?

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (6965960) 78.98% compared to head (aadcb0f) 77.01%.
Report is 71 commits behind head on main.

❗ Current head aadcb0f differs from pull request most recent head 7eda114. Consider uploading reports for the commit 7eda114 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6642      +/-   ##
==========================================
- Coverage   78.98%   77.01%   -1.98%     
==========================================
  Files        2903     2936      +33     
  Lines      139771   141730    +1959     
==========================================
- Hits       110397   109150    -1247     
- Misses      29374    32580    +3206     

Flag	Coverage Δ
unittests	77.01% <89.28%> (-1.98%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...e/src/CookieCrumble/Extensions/WriterExtensions.cs	100.00% <ø> (ø)
...CookieCrumble/src/CookieCrumble/TestEnvironment.cs	0.00% <ø> (ø)
...polloFederationRequestExecutorBuilderExtensions.cs	66.66% <100.00%> (ø)
...ensions/ApolloFederationSchemaBuilderExtensions.cs	86.66% <ø> (ø)
.../src/ApolloFederation/FederationTypeInterceptor.cs	100.00% <100.00%> (ø)
...ion/src/ApolloFederation/Helpers/ArgumentParser.cs	68.65% <100.00%> (+0.47%)	⬆️
...rc/AspNetCore.CommandLine/Command/ExportCommand.cs	100.00% <100.00%> (ø)
...rc/AspNetCore/Extensions/HttpResponseExtensions.cs	26.31% <ø> (+4.57%)	⬆️
...olate/AspNetCore/src/AspNetCore/HeaderUtilities.cs	80.85% <ø> (ø)
...ate/AspNetCore/src/AspNetCore/HttpGetMiddleware.cs	82.31% <ø> (ø)
... and 99 more

... and 248 files with indirect coverage changes

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[michaelstaib]

Thank you for your help on Hot Chocolate!