Tests

Address code duplication in mypyc/lib-rt #19629

Job	Run time
Test mypyc suite with 32-bit Python	9m 15s
Test suite with py311-ubuntu	9m 1s
Test suite with py310-ubuntu, mypyc-compiled	13m 56s
Test suite with py313-ubuntu, mypyc-compiled	13m 37s
Test suite with py314-windows-64	25m 1s
Test suite with py312-ubuntu	10m 0s
Test suite with py314-ubuntu, mypyc-compiled	13m 38s
Parallel tests with py314-ubuntu, mypyc-compiled	24m 51s
mypyc runtime tests with py313-macos	4m 45s
mypyc runtime tests with py310-ubuntu	5m 6s
Type check our own code (py310-ubuntu)	1m 42s
Formatting and code style with Black + ruff	1m 57s
Parallel tests with py314-ubuntu, interpreted	22m 14s
Type check our own code (py310-windows-64)	2m 24s
	2h 37m 27s

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