Tests

Enable --pretty by default #16417

Job	Run time
Test mypyc suite with 32-bit Python	8m 37s
Test suite with py313-ubuntu, mypyc-compiled	14m 19s
Test suite with py39-windows-64	23m 41s
Test suite with py311-ubuntu	9m 56s
Test suite with py39-ubuntu, mypyc-compiled	15m 23s
Test suite with py312-ubuntu, mypyc-compiled	14m 10s
Test suite with py310-ubuntu	12m 53s
Formatting and code style with Black + ruff	1m 45s
Type check our own code (py39-ubuntu)	1m 51s
Test suite with py314-dev-ubuntu	17m 8s
mypyc runtime tests with py39-macos	4m 57s
Type check our own code (py39-windows-64)	2m 26s
	2h 7m 6s

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