Tests

Add support for Final[...] in dataclasses #21951

Job	Run time
Test mypyc suite with 32-bit Python	9m 57s
Test suite with py312-ubuntu	9m 16s
Test suite with py310-ubuntu, mypyc-compiled	16m 23s
Test suite with py314-ubuntu, mypyc-compiled	15m 38s
Test suite with py313-ubuntu, mypyc-compiled	15m 19s
Test suite with py314t-ubuntu, mypyc-compiled	17m 44s
Formatting and code style with Black + ruff	1m 57s
Type check our own code (py310-windows-64)	2m 31s
Test suite with py314-windows-64	30m 53s
mypyc runtime tests with py310-ubuntu	6m 34s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 52s
Type check our own code (py310-ubuntu)	1m 11s
Parallel tests with py314-windows-64, interpreted	10m 8s
Test suite with py311-ubuntu	9m 10s
mypyc runtime tests with py313-macos	5m 40s
Parallel tests with py314-ubuntu, interpreted	24m 3s
	3h 25m 16s

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