Tests

docs: writeup cc for comparing_type_narrowing_helper #20928

Job	Run time
Test mypyc suite with 32-bit Python	9m 33s
Parallel tests with py314-ubuntu, interpreted	22m 41s
Test suite with py312-ubuntu	8m 51s
Test suite with py313-ubuntu, mypyc-compiled	14m 40s
Test suite with py310-ubuntu, mypyc-compiled	15m 4s
mypyc runtime tests with py313-macos	6m 22s
Parallel tests with py314-windows-64, interpreted	10m 8s
mypyc runtime tests with py310-ubuntu	5m 39s
Test suite with py311-ubuntu	8m 53s
Test suite with py314-windows-64	26m 52s
Test suite with py314t-ubuntu, mypyc-compiled	16m 56s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 9s
Type check our own code (py310-windows-64)	2m 49s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py310-ubuntu)	1m 41s
Test suite with py314-ubuntu, mypyc-compiled	14m 16s
	3h 16m 29s

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