Tests

Fix crashes on variadic unpacking in synthetic types (#21555) #22448

Job	Run time
Test mypyc suite with 32-bit Python	10m 58s
Test suite with py310-ubuntu, mypyc-compiled	17m 9s
Test suite with py314-ubuntu, mypyc-compiled	16m 10s
Formatting and code style with Black + ruff	1m 55s
Test suite with py313-ubuntu, mypyc-compiled	15m 51s
Test suite with py314t-ubuntu, mypyc-compiled	19m 6s
Test suite with py311-ubuntu	10m 9s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 35s
mypyc runtime tests with py313-macos	5m 19s
Type check our own code (py310-windows-64)	2m 16s
Parallel tests with py314-ubuntu, interpreted	28m 4s
Test suite with py314-windows-64	33m 31s
mypyc runtime tests with py310-ubuntu	7m 4s
Test suite with py312-ubuntu	10m 38s
Type check our own code (py310-ubuntu)	1m 5s
Test suite with py315-ubuntu, mypyc-compiled	16m 24s
Parallel tests with py314-windows-64, interpreted	11m 13s
	3h 57m 27s

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