Tests

Fix crash with tuple unpack inside TypeVar default #19837

Job	Run time
Test mypyc suite with 32-bit Python	9m 1s
Test suite with py314-ubuntu, mypyc-compiled	14m 25s
Test suite with py312-ubuntu	9m 52s
Test suite with py311-ubuntu	8m 50s
Test suite with py313-ubuntu, mypyc-compiled	14m 35s
Test suite with py314t-ubuntu, mypyc-compiled	15m 52s
Type check our own code (py310-ubuntu)	1m 45s
Parallel tests with py314-ubuntu, interpreted	23m 23s
Test suite with py314-windows-64	26m 6s
mypyc runtime tests with py313-macos	5m 38s
mypyc runtime tests with py310-ubuntu	5m 12s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 54s
Formatting and code style with Black + ruff	1m 59s
Type check our own code (py310-windows-64)	2m 24s
Test suite with py310-ubuntu, mypyc-compiled	14m 19s
	2h 59m 15s

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