Tests

Write serialized options to a file to broadcast to workers #21898

Job	Run time
Test mypyc suite with 32-bit Python	10m 28s
Test suite with py311-ubuntu	9m 11s
Parallel tests with py314-ubuntu, interpreted	24m 12s
Test suite with py314-windows-64	30m 52s
Test suite with py314-ubuntu, mypyc-compiled	15m 58s
Test suite with py314t-ubuntu, mypyc-compiled	17m 50s
Test suite with py313-ubuntu, mypyc-compiled	15m 23s
Test suite with py312-ubuntu	9m 37s
mypyc runtime tests with py310-ubuntu	6m 49s
Formatting and code style with Black + ruff	1m 49s
Test suite with py310-ubuntu, mypyc-compiled	16m 33s
mypyc runtime tests with py313-macos	5m 46s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 12s
Type check our own code (py310-ubuntu)	1m 10s
Parallel tests with py314-windows-64, interpreted	15m 31s
Type check our own code (py310-windows-64)	1m 53s
	3h 31m 14s

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