Restore only construct the allowed_methods set once for a StaticResource

[bdraco]

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

[codspeed-hq]

CodSpeed Performance Report

Merging #9976 will not alter performance

_{Comparing fix_set_once (305292e) with master (8704bc7)}

Summary

✅ 43 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.73%. Comparing base (8704bc7) to head (305292e).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9976      +/-   ##
==========================================
+ Coverage   98.71%   98.73%   +0.01%     
==========================================
  Files         121      121              
  Lines       36727    36730       +3     
  Branches     4383     4383              
==========================================
+ Hits        36254    36264      +10     
+ Misses        318      314       -4     
+ Partials      155      152       -3     

Flag	Coverage Δ
CI-GHA	98.62% <100.00%> (+0.01%)	⬆️
OS-Linux	98.31% <100.00%> (+0.01%)	⬆️
OS-Windows	96.13% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.40% <100.00%> (-0.01%)	⬇️
Py-3.10.11	97.25% <100.00%> (-0.01%)	⬇️
Py-3.10.15	97.85% <100.00%> (+0.05%)	⬆️
Py-3.11.10	97.84% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.29% <100.00%> (-0.01%)	⬇️
Py-3.12.7	98.37% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	98.31% <100.00%> (-0.05%)	⬇️
Py-3.9.13	97.17% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	97.72% <100.00%> (-0.05%)	⬇️
Py-pypy7.3.16	97.32% <100.00%> (?)
VM-macos	97.40% <100.00%> (-0.01%)	⬇️
VM-ubuntu	98.31% <100.00%> (+0.01%)	⬆️
VM-windows	96.13% <100.00%> (+<0.01%)	⬆️

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[patchback]

Backport to 3.11: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.11/2b40f6b79fae3bc84ff90f7dee6b8e780716d179/pr-9976

Backported as #9979

🤖 @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/3.12/2b40f6b79fae3bc84ff90f7dee6b8e780716d179/pr-9976

Backported as #9980

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