Tests

Prepare fixup for lazy deserialization #21611

Job	Run time
Test mypyc suite with 32-bit Python	9m 49s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 53s
Test suite with py312-ubuntu	9m 46s
mypyc runtime tests with py313-macos	4m 48s
Test suite with py311-ubuntu	9m 15s
Type check our own code (py310-ubuntu)	1m 46s
Test suite with py310-ubuntu, mypyc-compiled	16m 25s
Test suite with py314-windows-64	27m 55s
Formatting and code style with Black + ruff	1m 53s
Type check our own code (py310-windows-64)	2m 54s
mypyc runtime tests with py310-ubuntu	6m 26s
Test suite with py313-ubuntu, mypyc-compiled	15m 39s
Test suite with py314t-ubuntu, mypyc-compiled	20m 46s
Parallel tests with py314-ubuntu, interpreted	21m 58s
Test suite with py314-ubuntu, mypyc-compiled	15m 17s
Parallel tests with py314-windows-64, interpreted	9m 54s
	3h 22m 24s

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