Tests

Fix skipped imports considered stale #22580

Job	Run time
Test mypyc suite with 32-bit Python	11m 22s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 40s
Test suite with py314-ubuntu, mypyc-compiled	15m 49s
Parallel tests with py314-ubuntu, interpreted	25m 46s
Type check our own code (py310-ubuntu)	1m 5s
Type check our own code (py310-windows-64)	1m 47s
Test suite with py310-ubuntu, mypyc-compiled	16m 25s
Parallel tests with py314-windows-64, interpreted	9m 52s
Test suite with py314t-ubuntu, mypyc-compiled	17m 29s
Test suite with py313-ubuntu, mypyc-compiled	16m 16s
Formatting and code style with Black + ruff	1m 45s
mypyc runtime tests with py310-ubuntu	8m 7s
mypyc runtime tests with py313-macos	6m 48s
Test suite with py315-ubuntu, mypyc-compiled	16m 11s
Test suite with py314-windows-64	32m 58s
Test suite with py311-ubuntu	9m 44s
Test suite with py312-ubuntu	9m 54s
	3h 48m 58s

Provide feedback