Tests

Save work on emitting ignored diagnostics #20285

Job	Run time
Test mypyc suite with 32-bit Python	9m 35s
Test suite with py313-ubuntu, mypyc-compiled	14m 5s
Test suite with py314t-ubuntu, mypyc-compiled	16m 33s
Test suite with py314-ubuntu, mypyc-compiled	14m 35s
Test suite with py310-ubuntu, mypyc-compiled	15m 19s
Test suite with py311-ubuntu	9m 6s
Test suite with py312-ubuntu	9m 28s
mypyc runtime tests with py313-macos	4m 34s
Type check our own code (py310-windows-64)	2m 21s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 33s
Type check our own code (py310-ubuntu)	1m 41s
Formatting and code style with Black + ruff	1m 52s
Parallel tests with py314-ubuntu, interpreted	23m 8s
mypyc runtime tests with py310-ubuntu	5m 35s
Test suite with py314-windows-64	26m 50s
	3h 4m 15s

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