Tests

Save work on emitting ignored diagnostics (#20621) #20397

Job	Run time
Test mypyc suite with 32-bit Python	9m 13s
Test suite with py314-ubuntu, mypyc-compiled	14m 23s
Test suite with py313-ubuntu, mypyc-compiled	14m 10s
Test suite with py311-ubuntu	8m 45s
mypyc runtime tests with py310-ubuntu	5m 36s
mypyc runtime tests with py313-macos	6m 19s
Test suite with py314t-ubuntu, mypyc-compiled	15m 37s
Test suite with py312-ubuntu	8m 37s
Type check our own code (py310-windows-64)	2m 21s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 58s
Parallel tests with py314-ubuntu, interpreted	24m 12s
Test suite with py310-ubuntu, mypyc-compiled	15m 39s
Type check our own code (py310-ubuntu)	1m 41s
Formatting and code style with Black + ruff	1m 45s
Test suite with py314-windows-64	27m 23s
	3h 6m 39s

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