Tests

[mypyc] Document librt.threading (#21697) #22675

Job	Run time
Test mypyc suite with 32-bit Python	11m 0s
Test suite with py310-ubuntu, mypyc-compiled	17m 18s
Parallel tests with py314-ubuntu, interpreted	25m 50s
Test suite with py314-ubuntu, mypyc-compiled	16m 11s
Test suite with py312-ubuntu	9m 56s
Test suite with py314t-ubuntu, mypyc-compiled	18m 58s
Parallel tests with py314-windows-64, interpreted	10m 12s
Type check our own code (py310-windows-64)	2m 24s
Test suite with py313-ubuntu, mypyc-compiled	16m 23s
mypyc runtime tests with py313-macos	11m 23s
Test suite with py311-ubuntu	9m 51s
mypyc runtime tests with py310-ubuntu	7m 17s
Test suite with py315-ubuntu, mypyc-compiled	16m 32s
Test suite with py314-windows-64	33m 48s
Type check our own code (py310-ubuntu)	1m 10s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 6s
Formatting and code style with Black + ruff	1m 53s
	3h 57m 12s

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