Tests

Programmatically enforce help style rules #19254

Job	Run time
Test mypyc suite with 32-bit Python	7m 6s
Test suite with py312-ubuntu, mypyc-compiled	27s
Test suite with py39-ubuntu, mypyc-compiled	26s
Test suite with py313-ubuntu, mypyc-compiled	27s
Test suite with py314-ubuntu, mypyc-compiled	27s
Test suite with py310-ubuntu	5m 37s
Test suite with py314-windows-64	11m 22s
Test suite with py311-ubuntu	4m 51s
mypyc runtime tests with py313-macos	1m 10s
Type check our own code (py39-windows-64)	1m 11s
Formatting and code style with Black + ruff	2m 7s
Type check our own code (py39-ubuntu)	29s
mypyc runtime tests with py310-ubuntu	2m 19s
	37m 59s

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