Tests

Improve decorator type error message for decorated functions (#16295) #19685

Job	Run time
Test mypyc suite with 32-bit Python	9m 27s
Test suite with py313-ubuntu, mypyc-compiled	14m 40s
Test suite with py311-ubuntu	9m 9s
Test suite with py314-ubuntu, mypyc-compiled	14m 11s
Test suite with py314t-ubuntu, mypyc-compiled	16m 28s
Test suite with py312-ubuntu	9m 57s
Parallel tests with py314-ubuntu, interpreted	22m 30s
Test suite with py314-windows-64	26m 30s
Test suite with py310-ubuntu, mypyc-compiled	13m 31s
mypyc runtime tests with py313-macos	6m 28s
Type check our own code (py310-windows-64)	2m 42s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py310-ubuntu)	1m 40s
mypyc runtime tests with py310-ubuntu	5m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 23s
	3h 3m 40s

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