Tests

Fix various bugs in TypeVarTuples with defaults #22418

Job	Run time
Test suite with py314-ubuntu, mypyc-compiled	16m 14s
mypyc runtime tests with py313-macos	5m 32s
Test suite with py315-ubuntu, mypyc-compiled	16m 33s
Test suite with py310-ubuntu, mypyc-compiled	17m 9s
mypyc runtime tests with py310-ubuntu	7m 16s
Parallel tests with py314-ubuntu, interpreted	29m 11s
Test suite with py313-ubuntu, mypyc-compiled	15m 38s
Test suite with py311-ubuntu	9m 55s
Type check our own code (py310-ubuntu)	1m 9s
Test suite with py314t-ubuntu, mypyc-compiled	18m 59s
Parallel tests with py314-ubuntu, mypyc-compiled	31m 31s
Type check our own code (py310-windows-64)	2m 11s
Test suite with py314-windows-64	29m 36s
Parallel tests with py314-windows-64, interpreted	12m 13s
Formatting and code style with Black + ruff	1m 59s
Test mypyc suite with 32-bit Python	12m 0s
Test suite with py312-ubuntu	10m 27s
	3h 57m 33s

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