Tests

[mypyc] Fix incremental compilation with `separate` flag (1/3) #21880

Job	Run time
Parallel tests with py314-windows-64, interpreted	2m 32s
Type check our own code (py310-windows-64)	1m 51s
Parallel tests with py314-ubuntu, interpreted	2m 42s
Test suite with py310-ubuntu, mypyc-compiled	2m 39s
mypyc runtime tests with py310-ubuntu	2m 40s
Test suite with py312-ubuntu	2m 40s
Formatting and code style with Black + ruff	1m 54s
Test suite with py313-ubuntu, mypyc-compiled	2m 40s
Test suite with py311-ubuntu	2m 48s
Test suite with py314-ubuntu, mypyc-compiled	2m 46s
Test suite with py314t-ubuntu, mypyc-compiled	2m 39s
mypyc runtime tests with py313-macos	2m 42s
Type check our own code (py310-ubuntu)	1m 11s
Test mypyc suite with 32-bit Python	2m 27s
Parallel tests with py314-ubuntu, mypyc-compiled	2m 45s
Test suite with py314-windows-64	2m 39s
	39m 35s

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