[PR #5431/751c3c4 backport][3.10] Re-introduce pytest-xdist in supported envs

[bdraco]

Co-authored-by: J. Nick Koston [email protected]
(cherry picked from commit 751c3c4)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.89%. Comparing base (1986b0a) to head (5c16281).
Report is 43 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.10    #9746      +/-   ##
==========================================
+ Coverage   97.80%   97.89%   +0.08%     
==========================================
  Files         112      112              
  Lines       35569    35640      +71     
  Branches     4281     4288       +7     
==========================================
+ Hits        34789    34890     +101     
+ Misses        583      557      -26     
+ Partials      197      193       -4     

Flag	Coverage Δ
CI-GHA	97.78% <100.00%> (+0.08%)	⬆️
OS-Linux	97.48% <100.00%> (+0.12%)	⬆️
OS-Windows	95.07% <100.00%> (+0.64%)	⬆️
OS-macOS	97.18% <100.00%> (+0.03%)	⬆️
Py-3.10.11	97.03% <99.03%> (+0.31%)	⬆️
Py-3.10.15	97.02% <99.03%> (+0.07%)	⬆️
Py-3.11.10	97.05% <99.03%> (+0.20%)	⬆️
Py-3.11.9	97.11% <99.03%> (+0.32%)	⬆️
Py-3.12.7	97.55% <99.03%> (+0.61%)	⬆️
Py-3.13.0	97.54% <99.03%> (?)
Py-3.8.10	94.46% <99.03%> (+0.03%)	⬆️
Py-3.8.18	96.77% <99.03%> (+0.20%)	⬆️
Py-3.9.13	96.95% <99.03%> (+0.32%)	⬆️
Py-3.9.20	96.90% <99.03%> (+0.20%)	⬆️
Py-pypy7.3.16	96.50% <99.03%> (?)
VM-macos	97.18% <100.00%> (+0.03%)	⬆️
VM-ubuntu	97.48% <100.00%> (+0.12%)	⬆️
VM-windows	95.07% <100.00%> (+0.64%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #9746 will not alter performance

_{Comparing patchback/backports/3.10/751c3c4e17d621ffc91b79dccb4e2a5ef8b42888/pr-5431 (5c16281) with 3.10 (1986b0a)}

Summary

✅ 14 untouched benchmarks