Tests

Fix nondeterminism from nonassociativity of overload joins (#21455) #22222

Job	Run time
Test mypyc suite with 32-bit Python	11m 33s
Test suite with py314-ubuntu, mypyc-compiled	16m 0s
Test suite with py311-ubuntu	9m 47s
Test suite with py312-ubuntu	9m 50s
Test suite with py314-windows-64	32m 31s
Type check our own code (py310-windows-64)	2m 25s
Parallel tests with py314-ubuntu, interpreted	26m 9s
Test suite with py310-ubuntu, mypyc-compiled	16m 43s
Test suite with py313-ubuntu, mypyc-compiled	16m 8s
mypyc runtime tests with py313-macos	5m 57s
Formatting and code style with Black + ruff	1m 53s
Test suite with py314t-ubuntu, mypyc-compiled	17m 19s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 20s
Parallel tests with py314-windows-64, interpreted	10m 9s
mypyc runtime tests with py310-ubuntu	6m 46s
Type check our own code (py310-ubuntu)	1m 12s
Test suite with py315-ubuntu, mypyc-compiled	16m 6s
	3h 49m 48s

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