Fix Python parser chunked handling with multiple Transfer-Encoding values

[Dreamsorcerer]

(cherry picked from commit faa15fd)

[codecov]

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Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #8843   +/-   ##
=======================================
  Coverage        ?   97.70%           
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  Files           ?      108           
  Lines           ?    34183           
  Branches        ?     4061           
=======================================
  Hits            ?    33399           
  Misses          ?      586           
  Partials        ?      198           

Flag	Coverage Δ
CI-GHA	97.60% <100.00%> (?)
OS-Linux	97.27% <100.00%> (?)
OS-Windows	94.82% <100.00%> (?)
OS-macOS	96.96% <100.00%> (?)
Py-3.10.11	97.05% <100.00%> (?)
Py-3.10.14	96.98% <100.00%> (?)
Py-3.11.9	97.22% <100.00%> (?)
Py-3.12.4	94.62% <100.00%> (?)
Py-3.12.5	97.01% <100.00%> (?)
Py-3.9.13	96.95% <100.00%> (?)
Py-3.9.19	96.89% <100.00%> (?)
Py-pypy7.3.16	96.48% <100.00%> (?)
VM-macos	96.96% <100.00%> (?)
VM-ubuntu	97.27% <100.00%> (?)
VM-windows	94.82% <100.00%> (?)

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