Tests

Reorganise mypy_self_check.ini #21061

Job	Run time
Test mypyc suite with 32-bit Python	33m 41s
Test suite with py312-ubuntu	8m 49s
Test suite with py314-ubuntu, mypyc-compiled	14m 16s
Test suite with py314-windows-64	26m 54s
Type check our own code (py310-ubuntu)	1m 32s
Test suite with py314t-ubuntu, mypyc-compiled	16m 10s
mypyc runtime tests with py313-macos	5m 5s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 39s
Parallel tests with py314-windows-64, interpreted	9m 53s
Parallel tests with py314-ubuntu, interpreted	25m 5s
Test suite with py313-ubuntu, mypyc-compiled	14m 30s
Test suite with py311-ubuntu	8m 20s
Formatting and code style with Black + ruff	1m 54s
mypyc runtime tests with py310-ubuntu	5m 36s
Type check our own code (py310-windows-64)	2m 38s
Test suite with py310-ubuntu, mypyc-compiled	14m 53s
	3h 36m 55s

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