[PR #9083/a6dd415 backport][3.10] Remove unused backwards compatibility code for old yarl versions

[bdraco]

(cherry picked from commit a6dd415)

We ended up bumping yarl to 1.12.0+ for path_safe so we can remove these compat shims

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.78%. Comparing base (a8542a8) to head (e3702f8).
Report is 2 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.10    #9289      +/-   ##
==========================================
- Coverage   97.78%   97.78%   -0.01%     
==========================================
  Files         108      108              
  Lines       34840    34828      -12     
  Branches     4164     4158       -6     
==========================================
- Hits        34070    34058      -12     
  Misses        573      573              
  Partials      197      197              

Flag	Coverage Δ
CI-GHA	97.68% <100.00%> (-0.01%)	⬇️
OS-Linux	97.36% <100.00%> (-0.01%)	⬇️
OS-Windows	94.97% <100.00%> (-0.01%)	⬇️
OS-macOS	97.06% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.04% <100.00%> (-0.01%)	⬇️
Py-3.10.15	96.98% <100.00%> (-0.01%)	⬇️
Py-3.11.10	96.94% <100.00%> (-0.01%)	⬇️
Py-3.11.9	97.02% <100.00%> (+<0.01%)	⬆️
Py-3.12.6	97.40% <100.00%> (-0.01%)	⬇️
Py-3.13.0-rc.2	97.39% <100.00%> (-0.01%)	⬇️
Py-3.8.10	94.48% <100.00%> (-0.01%)	⬇️
Py-3.8.18	96.77% <100.00%> (-0.01%)	⬇️
Py-3.9.13	96.95% <100.00%> (-0.01%)	⬇️
Py-3.9.20	96.89% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	96.50% <100.00%> (-0.01%)	⬇️
VM-macos	97.06% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.36% <100.00%> (-0.01%)	⬇️
VM-windows	94.97% <100.00%> (-0.01%)	⬇️

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