Tests

Stubtest: give more helpful errors if a function is missing from the stub #11622

Job	Run time
Test mypyc suite with 32-bit Python	8m 16s
Test suite with py38-ubuntu, mypyc-compiled	20m 36s
Test suite with py38-windows-64	26m 51s
Test suite with py39-ubuntu	19m 31s
Test suite with py310-ubuntu	18m 8s
Test suite with py311-ubuntu, mypyc-compiled	18m 2s
Test suite with py312-ubuntu, mypyc-compiled	20m 59s
mypyc runtime tests with py39-macos	4m 32s
mypyc runtime tests with py38-debug-build-ubuntu	5m 21s
Type check our own code (py38-ubuntu)	1m 43s
Type check our own code (py38-windows-64)	2m 21s
Formatting and code style with Black + ruff	36s
	2h 26m 56s

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