Tests

[mypyc] Enable incremental self-compilation (#21369) #22195

Job	Run time
Test mypyc suite with 32-bit Python	10m 13s
Test suite with py310-ubuntu, mypyc-compiled	16m 32s
Test suite with py312-ubuntu	10m 4s
Test suite with py314-windows-64	31m 57s
Test suite with py314t-ubuntu, mypyc-compiled	18m 48s
Test suite with py313-ubuntu, mypyc-compiled	16m 26s
Test suite with py314-ubuntu, mypyc-compiled	17m 18s
Parallel tests with py314-windows-64, interpreted	9m 22s
Test suite with py311-ubuntu	9m 40s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 14s
Type check our own code (py310-windows-64)	2m 5s
mypyc runtime tests with py310-ubuntu	6m 43s
Formatting and code style with Black + ruff	1m 51s
Parallel tests with py314-ubuntu, interpreted	26m 56s
Type check our own code (py310-ubuntu)	1m 13s
mypyc runtime tests with py313-macos	5m 55s
	3h 34m 17s

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