Tests

Add flag to reveal simpler types #20962

Job	Run time
Test mypyc suite with 32-bit Python	9m 38s
Test suite with py313-ubuntu, mypyc-compiled	14m 34s
Test suite with py311-ubuntu	8m 36s
Test suite with py314-ubuntu, mypyc-compiled	14m 16s
Test suite with py314t-ubuntu, mypyc-compiled	16m 11s
Test suite with py312-ubuntu	9m 1s
Test suite with py310-ubuntu, mypyc-compiled	15m 33s
mypyc runtime tests with py310-ubuntu	5m 25s
Parallel tests with py314-windows-64, interpreted	9m 0s
Type check our own code (py310-windows-64)	2m 25s
mypyc runtime tests with py313-macos	6m 34s
Parallel tests with py314-ubuntu, mypyc-compiled	31m 5s
Formatting and code style with Black + ruff	1m 58s
Type check our own code (py310-ubuntu)	1m 41s
Parallel tests with py314-ubuntu, interpreted	24m 29s
Test suite with py314-windows-64	25m 3s
	3h 15m 29s

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