Add 304 benchmark for FileResponse

[bdraco]

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

[codspeed-hq]

CodSpeed Performance Report

Merging #10114 will not alter performance

_{Comparing add_304_benchmark (979453d) with master (84bb77d)}

Summary

✅ 46 untouched benchmarks
🆕 1 new benchmarks

Benchmarks breakdown

	Benchmark	master	add_304_benchmark	Change
🆕	test_simple_web_file_response_not_modified[pyloop]	N/A	67.8 ms	N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.76%. Comparing base (84bb77d) to head (979453d).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10114   +/-   ##
=======================================
  Coverage   98.75%   98.76%           
=======================================
  Files         122      122           
  Lines       36927    36952   +25     
  Branches     4409     4411    +2     
=======================================
+ Hits        36469    36494   +25     
  Misses        311      311           
  Partials      147      147           

Flag	Coverage Δ
CI-GHA	98.64% <100.00%> (+<0.01%)	⬆️
OS-Linux	98.33% <100.00%> (+<0.01%)	⬆️
OS-Windows	96.18% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.44% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.28% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.87% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	97.86% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.33% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	98.38% <100.00%> (-0.01%)	⬇️
Py-3.13.0	97.19% <100.00%> (+<0.01%)	⬆️
Py-3.13.1	98.35% <100.00%> (-0.01%)	⬇️
Py-3.9.13	97.19% <100.00%> (-0.01%)	⬇️
Py-3.9.20	97.73% <100.00%> (-0.05%)	⬇️
Py-pypy7.3.16	97.34% <100.00%> (-0.01%)	⬇️
VM-macos	97.44% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	98.33% <100.00%> (+<0.01%)	⬆️
VM-windows	96.18% <100.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.11: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.11/9456955401cb8e78c363a92d829d924ef87bd004/pr-10114

Backported as #10115

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.12: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.12/9456955401cb8e78c363a92d829d924ef87bd004/pr-10114

Backported as #10116

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.