Tests

Make the space in error comments optional #20855

Job	Run time
Test mypyc suite with 32-bit Python	9m 21s
Test suite with py312-ubuntu	8m 41s
Test suite with py311-ubuntu	8m 33s
Type check our own code (py310-ubuntu)	1m 42s
Test suite with py313-ubuntu, mypyc-compiled	13m 53s
Test suite with py314t-ubuntu, mypyc-compiled	15m 49s
Parallel tests with py314-windows-64, interpreted	10m 13s
mypyc runtime tests with py313-macos	4m 40s
Test suite with py314-ubuntu, mypyc-compiled	14m 34s
Test suite with py314-windows-64	26m 12s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 18s
mypyc runtime tests with py310-ubuntu	5m 31s
Formatting and code style with Black + ruff	2m 7s
Parallel tests with py314-ubuntu, interpreted	24m 38s
Type check our own code (py310-windows-64)	2m 22s
Test suite with py310-ubuntu, mypyc-compiled	14m 34s
	3h 11m 8s

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