Tests

Check functions without annotations in mypyc tests #17847

Job	Run time
Test mypyc suite with 32-bit Python	8m 24s
Type check our own code (py39-windows-64)	2m 30s
Test suite with py312-ubuntu, mypyc-compiled	15m 12s
Test suite with py39-ubuntu, mypyc-compiled	17m 12s
Test suite with py313-ubuntu, mypyc-compiled	13m 1s
Test suite with py314-dev-ubuntu	18m 26s
Test suite with py313-windows-64	22m 47s
Type check our own code (py39-ubuntu)	1m 39s
Test suite with py311-ubuntu	8m 5s
mypyc runtime tests with py39-macos	8m 1s
Test suite with py310-ubuntu	10m 41s
Formatting and code style with Black + ruff	1m 53s
	2h 7m 51s

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