Tests

Avoid treating `pass` and `...` as no-op for reachability #19876

Job	Run time
Test mypyc suite with 32-bit Python	9m 27s
Test suite with py313-ubuntu, mypyc-compiled	13m 42s
Test suite with py312-ubuntu	9m 56s
Test suite with py311-ubuntu	9m 12s
Test suite with py314-ubuntu, mypyc-compiled	14m 13s
Test suite with py310-ubuntu, mypyc-compiled	13m 25s
mypyc runtime tests with py310-ubuntu	5m 19s
Test suite with py314t-ubuntu, mypyc-compiled	16m 16s
Test suite with py314-windows-64	27m 8s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 35s
Type check our own code (py310-windows-64)	2m 19s
Type check our own code (py310-ubuntu)	1m 45s
mypyc runtime tests with py313-macos	4m 32s
Formatting and code style with Black + ruff	1m 58s
Parallel tests with py314-ubuntu, interpreted	22m 32s
	2h 59m 19s

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