Tests

Fix edge cases in variadic tuple subclasses #22345

Job	Run time
Test mypyc suite with 32-bit Python	10m 42s
Test suite with py310-ubuntu, mypyc-compiled	16m 23s
Test suite with py314-ubuntu, mypyc-compiled	15m 52s
Test suite with py313-ubuntu, mypyc-compiled	16m 50s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 10s
Test suite with py314t-ubuntu, mypyc-compiled	18m 29s
Test suite with py314-windows-64	30m 4s
Test suite with py315-ubuntu, mypyc-compiled	16m 49s
Test suite with py311-ubuntu	9m 27s
Type check our own code (py310-windows-64)	1m 56s
Type check our own code (py310-ubuntu)	1m 6s
mypyc runtime tests with py310-ubuntu	7m 16s
mypyc runtime tests with py313-macos	6m 24s
Test suite with py312-ubuntu	10m 3s
Parallel tests with py314-windows-64, interpreted	11m 14s
Parallel tests with py314-ubuntu, interpreted	24m 41s
Formatting and code style with Black + ruff	1m 43s
	3h 49m 9s

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