[PR #10058/12372d7 backport][3.11] Remove unreachable content length check for chunked encoding

[bdraco]

(cherry picked from commit 12372d7)

[codspeed-hq]

CodSpeed Performance Report

Merging #10060 will not alter performance

_{Comparing patchback/backports/3.11/12372d7fe06d95c1c633a3b8119aecf4e86cf94d/pr-10058 (3fe926f) with 3.11 (7e628f4)}

Summary

✅ 44 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.06%. Comparing base (7e628f4) to head (3fe926f).
Report is 1 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11   #10060      +/-   ##
==========================================
+ Coverage   97.93%   98.06%   +0.13%     
==========================================
  Files         122      122              
  Lines       36965    36968       +3     
  Branches     4442     4451       +9     
==========================================
+ Hits        36200    36251      +51     
+ Misses        567      540      -27     
+ Partials      198      177      -21     

Flag	Coverage Δ
CI-GHA	97.95% <100.00%> (+0.10%)	⬆️
OS-Linux	97.65% <100.00%> (+0.10%)	⬆️
OS-Windows	94.56% <100.00%> (+0.10%)	⬆️
OS-macOS	96.78% <100.00%> (+0.10%)	⬆️
Py-3.10.11	96.62% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.21% <100.00%> (+0.05%)	⬆️
Py-3.11.10	97.23% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	96.70% <100.00%> (+0.30%)	⬆️
Py-3.12.7	97.72% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	97.71% <100.00%> (+0.94%)	⬆️
Py-3.9.13	96.55% <100.00%> (?)
Py-3.9.20	97.09% <100.00%> (?)
Py-pypy7.3.16	96.69% <100.00%> (?)
VM-macos	96.78% <100.00%> (+0.10%)	⬆️
VM-ubuntu	97.65% <100.00%> (+0.10%)	⬆️
VM-windows	94.56% <100.00%> (+0.10%)	⬆️

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