Tests

Fix skipped imports considered stale #22574

Job	Run time
Test mypyc suite with 32-bit Python	11m 49s
Test suite with py312-ubuntu	10m 20s
Test suite with py314-ubuntu, mypyc-compiled	15m 52s
Test suite with py313-ubuntu, mypyc-compiled	16m 53s
Test suite with py311-ubuntu	9m 32s
Test suite with py314t-ubuntu, mypyc-compiled	18m 2s
mypyc runtime tests with py313-macos	6m 24s
Parallel tests with py314-ubuntu, interpreted	25m 46s
Test suite with py315-ubuntu, mypyc-compiled	15m 44s
Test suite with py314-windows-64	31m 23s
Type check our own code (py310-ubuntu)	1m 12s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 13s
Parallel tests with py314-windows-64, interpreted	11m 1s
Type check our own code (py310-windows-64)	1m 54s
Formatting and code style with Black + ruff	1m 46s
mypyc runtime tests with py310-ubuntu	7m 48s
Test suite with py310-ubuntu, mypyc-compiled	17m 16s
	3h 51m 55s

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