Tests

Fix parallel worker crash on syntax error (#21202) #21636

Job	Run time
Test mypyc suite with 32-bit Python	10m 41s
Test suite with py310-ubuntu, mypyc-compiled	15m 50s
Test suite with py311-ubuntu	9m 13s
Test suite with py313-ubuntu, mypyc-compiled	15m 26s
Test suite with py314t-ubuntu, mypyc-compiled	20m 41s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 33s
Test suite with py314-ubuntu, mypyc-compiled	15m 18s
mypyc runtime tests with py310-ubuntu	6m 37s
mypyc runtime tests with py313-macos	7m 30s
Parallel tests with py314-windows-64, interpreted	10m 2s
Test suite with py312-ubuntu	9m 52s
Parallel tests with py314-ubuntu, interpreted	25m 54s
Type check our own code (py310-ubuntu)	1m 34s
Type check our own code (py310-windows-64)	2m 36s
Test suite with py314-windows-64	24m 44s
Formatting and code style with Black + ruff	1m 49s
	3h 24m 20s

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