[PR #8456/b09d7cc backport][3.10] Add ClientConnectorDNSError for differentiating DNS errors from others

[bdraco]

Co-authored-by: J. Nick Koston nick@koston.org
(cherry picked from commit b09d7cc)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.82%. Comparing base (cdf3dca) to head (dece0db).
Report is 1 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #9459   +/-   ##
=======================================
  Coverage   97.82%   97.82%           
=======================================
  Files         106      106           
  Lines       35046    35063   +17     
  Branches     4216     4219    +3     
=======================================
+ Hits        34282    34299   +17     
  Misses        568      568           
  Partials      196      196           

Flag	Coverage Δ
CI-GHA	97.70% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.39% <100.00%> (-0.01%)	⬇️
OS-Windows	94.93% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.08% <100.00%> (-0.01%)	⬇️
Py-3.10.11	96.95% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	96.88% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	96.97% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.03% <100.00%> (-0.02%)	⬇️
Py-3.12.7	97.43% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	97.41% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.32% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.68% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.86% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	96.80% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.40% <100.00%> (+<0.01%)	⬆️
VM-macos	97.08% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.39% <100.00%> (-0.01%)	⬇️
VM-windows	94.93% <100.00%> (+<0.01%)	⬆️

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