Tests

Prepare fixup for lazy deserialization #21556

Job	Run time
Test mypyc suite with 32-bit Python	10m 23s
Test suite with py313-ubuntu, mypyc-compiled	16m 32s
Test suite with py312-ubuntu	10m 16s
Test suite with py311-ubuntu	9m 56s
mypyc runtime tests with py310-ubuntu	6m 23s
Test suite with py310-ubuntu, mypyc-compiled	17m 2s
Test suite with py314-ubuntu, mypyc-compiled	16m 35s
Parallel tests with py314-ubuntu, interpreted	24m 43s
Test suite with py314t-ubuntu, mypyc-compiled	23m 8s
Type check our own code (py310-ubuntu)	2m 3s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 18s
Formatting and code style with Black + ruff	1m 56s
mypyc runtime tests with py313-macos	4m 58s
Type check our own code (py310-windows-64)	2m 15s
Parallel tests with py314-windows-64, interpreted	9m 33s
Test suite with py314-windows-64	28m 59s
	3h 30m 0s

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