Tests

Speed up transitive_dep_hash for singleton SCCs (#21390) #22504

Job	Run time
Test mypyc suite with 32-bit Python	11m 5s
Test suite with py310-ubuntu, mypyc-compiled	16m 37s
mypyc runtime tests with py310-ubuntu	7m 38s
Test suite with py314-ubuntu, mypyc-compiled	15m 51s
Type check our own code (py310-windows-64)	1m 56s
Test suite with py313-ubuntu, mypyc-compiled	15m 51s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 29s
Test suite with py314-windows-64	29m 29s
Test suite with py312-ubuntu	10m 45s
Test suite with py311-ubuntu	10m 3s
Formatting and code style with Black + ruff	1m 53s
Parallel tests with py314-ubuntu, interpreted	25m 19s
Parallel tests with py314-windows-64, interpreted	10m 57s
Type check our own code (py310-ubuntu)	1m 10s
Test suite with py315-ubuntu, mypyc-compiled	16m 57s
Test suite with py314t-ubuntu, mypyc-compiled	17m 44s
mypyc runtime tests with py313-macos	7m 58s
	3h 50m 42s

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