[PR #9485/da0099dc backport][3.11] Avoid passing client writer to response when already finished

[patchback]

This is a backport of PR #9485 as merged into master (da0099d).

What do these changes do?

With Python 3.12+ its likely that the writer can finish synchronously (on a production HA instance, it always did for all samples in a 60s period). In this case avoid passing it to the response since it will get unset right away needlessly

Are there changes in behavior for the user?

no

[codecov]

Codecov Report

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Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9493   +/-   ##
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  Coverage        ?   97.85%           
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  Files           ?      106           
  Lines           ?    35211           
  Branches        ?     4227           
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  Hits            ?    34455           
  Misses          ?      564           
  Partials        ?      192           

Flag	Coverage Δ
CI-GHA	97.73% <100.00%> (?)
OS-Linux	97.42% <100.00%> (?)
OS-Windows	94.85% <100.00%> (?)
OS-macOS	97.12% <100.00%> (?)
Py-3.10.11	96.98% <75.00%> (?)
Py-3.10.15	96.92% <75.00%> (?)
Py-3.11.10	97.00% <75.00%> (?)
Py-3.11.9	97.07% <75.00%> (?)
Py-3.12.7	97.46% <100.00%> (?)
Py-3.13.0	97.45% <100.00%> (?)
Py-3.9.13	96.89% <75.00%> (?)
Py-3.9.20	96.83% <75.00%> (?)
Py-pypy7.3.16	96.44% <75.00%> (?)
VM-macos	97.12% <100.00%> (?)
VM-ubuntu	97.42% <100.00%> (?)
VM-windows	94.85% <100.00%> (?)

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