Enable pytest-xdist when testing wheels (#9979)

Author: hugovk

.github/workflows/wheels-test.ps1

@@ -22,5 +22,5 @@ if (!$?) { exit $LASTEXITCODE }
 if (!$?) { exit $LASTEXITCODE }
 & $venv\Scripts\$python -m pytest -vv -x checks\check_wheel.py
 if (!$?) { exit $LASTEXITCODE }
-& $venv\Scripts\$python -m pytest -vv -x Tests
+& $venv\Scripts\$python -m pytest -vv -x --numprocesses=logical --dist=worksteal Tests
 if (!$?) { exit $LASTEXITCODE }

.github/workflows/wheels-test.sh

@@ -34,4 +34,4 @@ fi
 # Runs tests
 python3 selftest.py
 python3 -m pytest -vv -x checks/check_wheel.py
-python3 -m pytest -vv -x
+python3 -m pytest -vv -x --numprocesses=logical --dist=worksteal