Tests

Add test for disabling syntax version checks in .pyi files #22495

Job	Run time
Test mypyc suite with 32-bit Python	11m 58s
Test suite with py314-windows-64	30m 14s
Test suite with py310-ubuntu, mypyc-compiled	16m 27s
mypyc runtime tests with py310-ubuntu	7m 4s
Test suite with py314-ubuntu, mypyc-compiled	15m 56s
Test suite with py311-ubuntu	9m 32s
mypyc runtime tests with py313-macos	9m 7s
Type check our own code (py310-windows-64)	1m 48s
Test suite with py312-ubuntu	10m 5s
Test suite with py314t-ubuntu, mypyc-compiled	17m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 55s
Parallel tests with py314-windows-64, interpreted	11m 44s
Test suite with py315-ubuntu, mypyc-compiled	15m 53s
Parallel tests with py314-ubuntu, interpreted	26m 10s
Formatting and code style with Black + ruff	1m 42s
Type check our own code (py310-ubuntu)	1m 17s
Test suite with py313-ubuntu, mypyc-compiled	15m 51s
	3h 52m 52s

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