Tests

Optimization: mark some classes as acyclic #20831

Job	Run time
Test mypyc suite with 32-bit Python	9m 56s
Test suite with py314t-ubuntu, mypyc-compiled	17m 19s
mypyc runtime tests with py313-macos	7m 34s
Formatting and code style with Black + ruff	1m 55s
Test suite with py314-windows-64	24m 52s
Test suite with py312-ubuntu	9m 11s
mypyc runtime tests with py310-ubuntu	5m 53s
Type check our own code (py310-ubuntu)	1m 53s
Parallel tests with py314-ubuntu, interpreted	25m 33s
Type check our own code (py310-windows-64)	2m 31s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 14s
Test suite with py313-ubuntu, mypyc-compiled	13m 29s
Test suite with py310-ubuntu, mypyc-compiled	14m 44s
Test suite with py314-ubuntu, mypyc-compiled	13m 54s
Test suite with py311-ubuntu	8m 39s
	3h 5m 37s

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