Tests

Fix parallel worker crash on syntax error #21635

Job	Run time
Test mypyc suite with 32-bit Python	10m 39s
Test suite with py311-ubuntu	8m 58s
Test suite with py312-ubuntu	9m 45s
Test suite with py310-ubuntu, mypyc-compiled	15m 51s
Test suite with py313-ubuntu, mypyc-compiled	15m 24s
Test suite with py314t-ubuntu, mypyc-compiled	22m 10s
mypyc runtime tests with py313-macos	6m 46s
Parallel tests with py314-windows-64, interpreted	10m 50s
Type check our own code (py310-windows-64)	2m 50s
Formatting and code style with Black + ruff	1m 45s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 13s
Test suite with py314-windows-64	27m 56s
Parallel tests with py314-ubuntu, interpreted	22m 26s
mypyc runtime tests with py310-ubuntu	6m 32s
Test suite with py314-ubuntu, mypyc-compiled	15m 30s
Type check our own code (py310-ubuntu)	1m 45s
	3h 26m 20s

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