Tests

[mypyc] feat: specialize `sum` using for loop helpers if possible [2/2] #19047

Job	Run time
Test mypyc suite with 32-bit Python	10m 35s
Test suite with py310-ubuntu	10m 55s
Test suite with py311-ubuntu	8m 38s
Test suite with py39-ubuntu, mypyc-compiled	15m 7s
Type check our own code (py39-ubuntu)	1m 44s
Test suite with py313-ubuntu, mypyc-compiled	14m 27s
Test suite with py312-ubuntu, mypyc-compiled	13m 12s
Test suite with py314-ubuntu, mypyc-compiled	14m 29s
Formatting and code style with Black + ruff	2m 11s
Test suite with py314-windows-64	23m 17s
mypyc runtime tests with py39-macos	6m 14s
Type check our own code (py39-windows-64)	3m 1s
	2h 3m 50s

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