Tests

lib-rt tests: discover lib-rt source more flexibly (#21034) #21408

Job	Run time
Test mypyc suite with 32-bit Python	9m 56s
Test suite with py310-ubuntu, mypyc-compiled	16m 19s
Test suite with py314-ubuntu, mypyc-compiled	16m 9s
Test suite with py314t-ubuntu, mypyc-compiled	18m 54s
Test suite with py312-ubuntu	9m 58s
Test suite with py313-ubuntu, mypyc-compiled	14m 56s
Type check our own code (py310-ubuntu)	1m 50s
Parallel tests with py314-windows-64, interpreted	12m 37s
mypyc runtime tests with py310-ubuntu	5m 56s
Test suite with py311-ubuntu	9m 24s
Parallel tests with py314-ubuntu, interpreted	24m 48s
Type check our own code (py310-windows-64)	2m 41s
Test suite with py314-windows-64	30m 56s
mypyc runtime tests with py313-macos	5m 14s
Formatting and code style with Black + ruff	1m 46s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 24s
	3h 28m 48s

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