[PR #9972/9916d329 backport][3.11] Revert "Only construct the allowed_methods set once for a StaticResource"

[patchback]

This is a backport of PR #9972 as merged into master (9916d32).

Reverts #9911

aiohttp-cors accesses the protected self._routes here and relies on being able to add new methods
https://github.com/aio-libs/aiohttp-cors/blob/38c6c17bffc805e46baccd7be1b4fd8c69d95dc3/aiohttp_cors/urldispatcher_router_adapter.py#L187

[codspeed-hq]

CodSpeed Performance Report

Merging #9973 will not alter performance

_{Comparing patchback/backports/3.11/9916d3298e84ea8fe8e5600b4b858b2829d21155/pr-9972 (44e2611) with 3.11 (902e7b2)}

Summary

✅ 43 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (3.11@85ef646). Learn more about missing BASE report.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9973   +/-   ##
=======================================
  Coverage        ?   98.02%           
=======================================
  Files           ?      122           
  Lines           ?    36866           
  Branches        ?     4438           
=======================================
  Hits            ?    36137           
  Misses          ?      545           
  Partials        ?      184           

Flag	Coverage Δ
CI-GHA	97.91% <100.00%> (?)
OS-Linux	97.61% <100.00%> (?)
OS-Windows	94.51% <100.00%> (?)
OS-macOS	96.73% <100.00%> (?)
Py-3.10.11	96.58% <100.00%> (?)
Py-3.10.15	97.12% <100.00%> (?)
Py-3.11.10	97.19% <100.00%> (?)
Py-3.11.9	96.66% <100.00%> (?)
Py-3.12.7	97.68% <100.00%> (?)
Py-3.13.0	97.67% <100.00%> (?)
Py-3.9.13	96.51% <100.00%> (?)
Py-3.9.20	97.09% <100.00%> (?)
Py-pypy7.3.16	96.65% <100.00%> (?)
VM-macos	96.73% <100.00%> (?)
VM-ubuntu	97.61% <100.00%> (?)
VM-windows	94.51% <100.00%> (?)

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