tests

Generate `distutils-stubs` on install #6195

Job	Run time
test_cygwin (39, windows-latest)	18m 10s
collateral (diffcov)	4m 58s
test (3.9, ubuntu-latest)	4m 4s
collateral (docs)	2m 7s
test (3.9, macos-latest)	4m 4s
test (3.9, windows-latest)	3m 54s
test (3.13, ubuntu-latest)	4m 4s
test (3.13, macos-latest)	4m 7s
test (3.13, windows-latest)	3m 55s
test (3.10, ubuntu-latest)	3m 50s
test (3.11, ubuntu-latest)	4m 2s
test (3.12, ubuntu-latest)	4m 4s
test (3.14, ubuntu-latest)	4m 6s
test (pypy3.10, ubuntu-latest, stdlib)	4m 3s
test (ubuntu-latest, 3.10, stdlib)	4m 9s
integration-test	0s
check	2s
release	0s
	1h 13m 39s

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