Return 500 error when handler has wrong return type (#8845)

[Dreamsorcerer]

(cherry picked from commit 48a5e07)

[codecov]

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Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #8891   +/-   ##
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  Coverage        ?   97.70%           
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  Files           ?      108           
  Lines           ?    34195           
  Branches        ?     4062           
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  Hits            ?    33411           
  Misses          ?      586           
  Partials        ?      198           

Flag	Coverage Δ
CI-GHA	97.60% <100.00%> (?)
OS-Linux	97.28% <100.00%> (?)
OS-Windows	94.83% <100.00%> (?)
OS-macOS	96.97% <100.00%> (?)
Py-3.10.11	97.05% <100.00%> (?)
Py-3.10.14	96.99% <100.00%> (?)
Py-3.11.9	97.22% <100.00%> (?)
Py-3.12.4	94.63% <100.00%> (?)
Py-3.12.5	97.02% <100.00%> (?)
Py-3.9.13	96.97% <100.00%> (?)
Py-3.9.19	96.90% <100.00%> (?)
Py-pypy7.3.16	96.49% <100.00%> (?)
VM-macos	96.97% <100.00%> (?)
VM-ubuntu	97.28% <100.00%> (?)
VM-windows	94.83% <100.00%> (?)

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