Tests

Fix debug build setup #20261

Job	Run time
Test mypyc suite with 32-bit Python	9m 38s
Test suite with py314t-ubuntu, mypyc-compiled	17m 21s
Parallel tests with py314-ubuntu, interpreted	23m 16s
mypyc runtime tests with py310-ubuntu	5m 9s
Test suite with py313-ubuntu, mypyc-compiled	14m 37s
Test suite with py311-ubuntu	9m 56s
Test suite with py314-windows-64	27m 42s
Test suite with py312-ubuntu	10m 5s
Type check our own code (py310-windows-64)	2m 30s
Formatting and code style with Black + ruff	1m 49s
mypyc runtime tests with py313-macos	4m 41s
Type check our own code (py310-ubuntu)	1m 44s
Test suite with py310-ubuntu, mypyc-compiled	15m 0s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 38s
Test suite with py314-ubuntu, mypyc-compiled	14m 43s
	3h 6m 49s

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