[PR #10004/a334eef7 backport][3.11] Avoid building skip_headers in ClientSession._request if it will be thrown away

[patchback]

This is a backport of PR #10004 as merged into master (a334eef).

There is a very good chance that we will build skip_headers and than throw it away as this option is not commonly passed.

[codspeed-hq]

CodSpeed Performance Report

Merging #10006 will not alter performance

_{Comparing patchback/backports/3.11/a334eef76c198746b8f02e9a8a89f083a918f076/pr-10004 (138379a) with 3.11 (b235e76)}

Summary

✅ 43 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (3.11@d030c05). Learn more about missing BASE report.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11   #10006   +/-   ##
=======================================
  Coverage        ?   98.02%           
=======================================
  Files           ?      122           
  Lines           ?    36903           
  Branches        ?     4441           
=======================================
  Hits            ?    36176           
  Misses          ?      544           
  Partials        ?      183           

Flag	Coverage Δ
CI-GHA	97.92% <100.00%> (?)
OS-Linux	97.62% <100.00%> (?)
OS-Windows	94.52% <ø> (?)
OS-macOS	96.73% <100.00%> (?)
Py-3.10.11	96.59% <100.00%> (?)
Py-3.10.15	97.18% <100.00%> (?)
Py-3.11.10	97.25% <100.00%> (?)
Py-3.11.9	96.66% <100.00%> (?)
Py-3.12.7	97.69% <100.00%> (?)
Py-3.13.0	97.64% <100.00%> (?)
Py-3.9.13	96.52% <100.00%> (?)
Py-3.9.20	97.10% <100.00%> (?)
Py-pypy7.3.16	96.66% <100.00%> (?)
VM-macos	96.73% <100.00%> (?)
VM-ubuntu	97.62% <100.00%> (?)
VM-windows	94.52% <ø> (?)

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