Tests

[mypyc] Enable incremental self-compilation #22036

Job	Run time
Test mypyc suite with 32-bit Python	10m 16s
Parallel tests with py314-windows-64, interpreted	10m 42s
Test suite with py314-windows-64	32m 51s
mypyc runtime tests with py310-ubuntu	5m 48s
Test suite with py310-ubuntu, mypyc-compiled	17m 19s
Test suite with py313-ubuntu, mypyc-compiled	15m 30s
Type check our own code (py310-ubuntu)	1m 14s
Test suite with py314-ubuntu, mypyc-compiled	15m 56s
Type check our own code (py310-windows-64)	1m 44s
Test suite with py312-ubuntu	10m 21s
Test suite with py314t-ubuntu, mypyc-compiled	17m 48s
Test suite with py311-ubuntu	9m 36s
mypyc runtime tests with py313-macos	7m 3s
Parallel tests with py314-ubuntu, interpreted	24m 2s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 30s
Formatting and code style with Black + ruff	1m 55s
	3h 30m 35s

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