Tests

Make `TypeForm` (PEP 747) no longer experimental #21175

Job	Run time
Test mypyc suite with 32-bit Python	9m 43s
Test suite with py314-windows-64	27m 10s
Test suite with py314t-ubuntu, mypyc-compiled	16m 51s
Test suite with py314-ubuntu, mypyc-compiled	15m 4s
Type check our own code (py310-windows-64)	2m 57s
Parallel tests with py314-ubuntu, interpreted	24m 30s
Test suite with py311-ubuntu	9m 2s
Test suite with py313-ubuntu, mypyc-compiled	14m 49s
Formatting and code style with Black + ruff	1m 58s
Parallel tests with py314-windows-64, interpreted	10m 16s
mypyc runtime tests with py313-macos	4m 41s
mypyc runtime tests with py310-ubuntu	5m 26s
Parallel tests with py314-ubuntu, mypyc-compiled	31m 24s
Type check our own code (py310-ubuntu)	1m 45s
Test suite with py310-ubuntu, mypyc-compiled	15m 21s
Test suite with py312-ubuntu	9m 7s
	3h 20m 4s

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