Tests

[mypyc] Fix incremental compilation with `separate` flag (1/3) #22004

Job	Run time
Test mypyc suite with 32-bit Python	10m 18s
Test suite with py312-ubuntu	9m 58s
Parallel tests with py314-ubuntu, interpreted	25m 31s
Test suite with py314-windows-64	33m 16s
mypyc runtime tests with py313-macos	7m 20s
Test suite with py314-ubuntu, mypyc-compiled	16m 8s
Test suite with py314t-ubuntu, mypyc-compiled	17m 58s
Parallel tests with py314-windows-64, interpreted	10m 54s
Formatting and code style with Black + ruff	1m 46s
Type check our own code (py310-windows-64)	1m 54s
Test suite with py310-ubuntu, mypyc-compiled	16m 26s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 19s
Test suite with py313-ubuntu, mypyc-compiled	15m 16s
Test suite with py311-ubuntu	9m 36s
Type check our own code (py310-ubuntu)	1m 19s
mypyc runtime tests with py310-ubuntu	5m 46s
	3h 30m 45s

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