Tests

stubtest: distinguish metaclass attributes from class attributes #14196

Job	Run time
Test suite with py38-ubuntu, mypyc-compiled	18m 9s
Test mypyc suite with 32-bit Python	7m 1s
Test suite with py38-windows-64	20m 39s
Test suite with py39-ubuntu	18m 14s
Test suite with py310-ubuntu	17m 12s
Test suite with py311-ubuntu, mypyc-compiled	16m 1s
Test suite with py312-ubuntu, mypyc-compiled	18m 9s
Test suite with py313-ubuntu, mypyc-compiled	18m 26s
mypyc runtime tests with py39-macos	4m 57s
Type check our own code (py38-ubuntu)	1m 57s
Type check our own code (py38-windows-64)	2m 29s
Formatting and code style with Black + ruff	59s
	2h 24m 13s

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