[PR #9976/2b40f6b7 backport][3.11] Restore only construct the allowed_methods set once for a StaticResource

[patchback]

This is a backport of PR #9976 as merged into master (2b40f6b).

Was reverted in #9972 because it introduced a regression with adding and OPTIONS method. Fix the set_options_route call instead and restore the change. There is now test coverage for this case as well via #9975

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.02%. Comparing base (454f914) to head (69cc304).
Report is 3 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.11    #9979      +/-   ##
==========================================
+ Coverage   96.65%   98.02%   +1.37%     
==========================================
  Files         120      122       +2     
  Lines       36805    36891      +86     
  Branches     4415     4440      +25     
==========================================
+ Hits        35573    36164     +591     
+ Misses       1004      544     -460     
+ Partials      228      183      -45     

Flag	Coverage Δ
CI-GHA	97.92% <100.00%> (+1.31%)	⬆️
OS-Linux	97.62% <100.00%> (?)
OS-Windows	94.52% <100.00%> (?)
OS-macOS	96.74% <100.00%> (+0.13%)	⬆️
Py-3.10.11	96.59% <100.00%> (+0.28%)	⬆️
Py-3.10.15	97.18% <100.00%> (?)
Py-3.11.10	97.20% <100.00%> (?)
Py-3.11.9	96.66% <100.00%> (+0.27%)	⬆️
Py-3.12.7	97.70% <100.00%> (?)
Py-3.13.0	97.68% <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	96.74% <100.00%> (+0.13%)	⬆️
VM-ubuntu	97.62% <100.00%> (?)
VM-windows	94.52% <100.00%> (?)

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[codspeed-hq]

CodSpeed Performance Report

Merging #9979 will improve performances by 25.9%

_{Comparing patchback/backports/3.11/2b40f6b79fae3bc84ff90f7dee6b8e780716d179/pr-9976 (69cc304) with 3.11 (902e7b2)}

Summary

⚡ 5 improvements
✅ 38 untouched benchmarks

Benchmarks breakdown

	Benchmark	3.11	patchback/backports/3.11/2b40f6b79fae3bc84ff90f7dee6b8e780716d179/pr-9976	Change
⚡	test_simple_web_response	637.2 µs	554.3 µs	+14.97%
⚡	test_simple_web_stream_response	392.9 µs	312.1 µs	+25.9%
⚡	test_web_response_with_bytes_body	727.5 µs	646.1 µs	+12.59%
⚡	test_web_response_with_headers	1.2 ms	1.1 ms	+8.14%
⚡	test_web_response_with_text_body	857 µs	775.8 µs	+10.46%