[PR #10114/94569554 backport][3.12] Add 304 benchmark for FileResponse

[patchback]

This is a backport of PR #10114 as merged into master (9456955).

related issue #10112
related comment #8013 (comment)
needed to prove out #10113

[codspeed-hq]

CodSpeed Performance Report

Merging #10116 will not alter performance

_{Comparing patchback/backports/3.12/9456955401cb8e78c363a92d829d924ef87bd004/pr-10114 (8d9815e) with 3.12 (8745cf4)}

Summary

✅ 46 untouched benchmarks
🆕 1 new benchmarks

Benchmarks breakdown

	Benchmark	3.12	patchback/backports/3.12/9456955401cb8e78c363a92d829d924ef87bd004/pr-10114	Change
🆕	test_simple_web_file_response_not_modified[pyloop]	N/A	67.9 ms	N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.06%. Comparing base (8745cf4) to head (8d9815e).
Report is 1 commits behind head on 3.12.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.12   #10116   +/-   ##
=======================================
  Coverage   98.06%   98.06%           
=======================================
  Files         123      123           
  Lines       37112    37137   +25     
  Branches     4466     4468    +2     
=======================================
+ Hits        36394    36419   +25     
  Misses        540      540           
  Partials      178      178           

Flag	Coverage Δ
CI-GHA	97.95% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.66% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.58% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.77% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	96.63% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.16% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.23% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	96.69% <100.00%> (-0.01%)	⬇️
Py-3.12.7	97.72% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	96.56% <100.00%> (+<0.01%)	⬆️
Py-3.13.1	97.68% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.55% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	97.13% <100.00%> (+0.01%)	⬆️
Py-pypy7.3.16	96.70% <100.00%> (+<0.01%)	⬆️
VM-macos	96.77% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.66% <100.00%> (+<0.01%)	⬆️
VM-windows	94.58% <100.00%> (+<0.01%)	⬆️

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