Tests

[mypyc] Make librt tests resilient to cleaning all .so files #22639

Job	Run time
Test mypyc suite with 32-bit Python	11m 58s
Test suite with py314-ubuntu, mypyc-compiled	15m 45s
Test suite with py313-ubuntu, mypyc-compiled	15m 51s
Test suite with py310-ubuntu, mypyc-compiled	16m 22s
Test suite with py315-ubuntu, mypyc-compiled	15m 48s
Test suite with py312-ubuntu	10m 13s
Test suite with py314-windows-64	33m 49s
Type check our own code (py310-windows-64)	4m 1s
Parallel tests with py314-ubuntu, interpreted	26m 32s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 56s
Test suite with py314t-ubuntu, mypyc-compiled	17m 9s
mypyc runtime tests with py310-ubuntu	7m 27s
mypyc runtime tests with py313-macos	8m 22s
Formatting and code style with Black + ruff	1m 57s
Parallel tests with py314-windows-64, interpreted	14m 12s
Type check our own code (py310-ubuntu)	1m 11s
Test suite with py311-ubuntu	9m 34s
	4h 0m 7s

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