Tests

Reorganise mypy_self_check.ini (#20515) #21062

Job	Run time
Test mypyc suite with 32-bit Python	9m 40s
Test suite with py314-windows-64	26m 20s
Test suite with py313-ubuntu, mypyc-compiled	13m 44s
Test suite with py311-ubuntu	8m 53s
Formatting and code style with Black + ruff	1m 53s
mypyc runtime tests with py313-macos	6m 36s
Type check our own code (py310-ubuntu)	1m 38s
Test suite with py314-ubuntu, mypyc-compiled	14m 16s
Test suite with py310-ubuntu, mypyc-compiled	14m 12s
Test suite with py314t-ubuntu, mypyc-compiled	16m 44s
mypyc runtime tests with py310-ubuntu	5m 44s
Parallel tests with py314-windows-64, interpreted	9m 49s
Test suite with py312-ubuntu	9m 0s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 13s
Parallel tests with py314-ubuntu, interpreted	22m 57s
Type check our own code (py310-windows-64)	3m 7s
	3h 14m 46s

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