Tests

Fix skipped imports considered stale (#21639) #22582

Job	Run time
Test mypyc suite with 32-bit Python	11m 23s
Test suite with py314-ubuntu, mypyc-compiled	15m 29s
Test suite with py312-ubuntu	10m 26s
Test suite with py311-ubuntu	9m 35s
Test suite with py315-ubuntu, mypyc-compiled	16m 5s
mypyc runtime tests with py313-macos	7m 35s
Type check our own code (py310-ubuntu)	53s
Formatting and code style with Black + ruff	1m 50s
Parallel tests with py314-ubuntu, interpreted	26m 19s
Type check our own code (py310-windows-64)	1m 49s
Test suite with py310-ubuntu, mypyc-compiled	18m 8s
mypyc runtime tests with py310-ubuntu	7m 44s
Test suite with py313-ubuntu, mypyc-compiled	16m 23s
Test suite with py314t-ubuntu, mypyc-compiled	18m 14s
Parallel tests with py314-windows-64, interpreted	12m 10s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 18s
Test suite with py314-windows-64	31m 3s
	3h 55m 24s

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