Tests

Fix skipped imports considered stale #22581

Job	Run time
Test mypyc suite with 32-bit Python	11m 13s
Test suite with py315-ubuntu, mypyc-compiled	16m 15s
Test suite with py314-ubuntu, mypyc-compiled	15m 46s
Test suite with py314t-ubuntu, mypyc-compiled	18m 20s
Parallel tests with py314-windows-64, interpreted	11m 4s
Test suite with py310-ubuntu, mypyc-compiled	17m 3s
mypyc runtime tests with py313-macos	7m 48s
mypyc runtime tests with py310-ubuntu	7m 29s
Parallel tests with py314-ubuntu, interpreted	26m 25s
Test suite with py313-ubuntu, mypyc-compiled	15m 30s
Formatting and code style with Black + ruff	1m 54s
Type check our own code (py310-ubuntu)	1m 7s
Type check our own code (py310-windows-64)	1m 49s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 53s
Test suite with py311-ubuntu	10m 1s
Test suite with py312-ubuntu	9m 47s
Test suite with py314-windows-64	32m 17s
	3h 51m 41s

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