Tests

Split type-checking into interface and implementation in parallel workers #21637

Job	Run time
Test mypyc suite with 32-bit Python	10m 14s
Test suite with py312-ubuntu	9m 32s
Test suite with py310-ubuntu, mypyc-compiled	16m 1s
Test suite with py314-ubuntu, mypyc-compiled	15m 27s
Test suite with py314t-ubuntu, mypyc-compiled	21m 37s
Parallel tests with py314-ubuntu, interpreted	22m 35s
Test suite with py314-windows-64	25m 9s
Test suite with py313-ubuntu, mypyc-compiled	15m 13s
mypyc runtime tests with py313-macos	5m 58s
Type check our own code (py310-windows-64)	4m 22s
Test suite with py311-ubuntu	8m 51s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 16s
Parallel tests with py314-windows-64, interpreted	10m 8s
mypyc runtime tests with py310-ubuntu	6m 20s
Type check our own code (py310-ubuntu)	1m 50s
Formatting and code style with Black + ruff	1m 52s
	3h 22m 25s

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