Tests

Fix stubtest false positive for properties with a deleter (#21259) #665

Job	Run time
Test mypyc suite with 32-bit Python	9m 41s
mypyc runtime tests with py313-macos	5m 56s
Test suite with py313-ubuntu, mypyc-compiled	15m 31s
Test suite with py312-ubuntu	9m 17s
Test suite with py310-ubuntu, mypyc-compiled	15m 36s
Test suite with py314-ubuntu, mypyc-compiled	14m 40s
Test suite with py314t-ubuntu, mypyc-compiled	17m 23s
Test suite with py311-ubuntu	8m 51s
Test suite with py314-windows-64	22m 46s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 15s
Parallel tests with py314-ubuntu, interpreted	23m 52s
Formatting and code style with Black + ruff	1m 50s
Type check our own code (py310-ubuntu)	1m 7s
Type check our own code (py310-windows-64)	1m 56s
mypyc runtime tests with py310-ubuntu	6m 34s
Parallel tests with py314-windows-64, interpreted	7m 45s
	3h 9m 0s

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