Tests

Remove prohibit_none_typevar_overlap #20981

Job	Run time
Test mypyc suite with 32-bit Python	9m 47s
Test suite with py314-windows-64	26m 38s
Type check our own code (py310-windows-64)	2m 52s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py310-ubuntu)	1m 40s
Parallel tests with py314-windows-64, interpreted	10m 43s
Test suite with py312-ubuntu	9m 25s
Test suite with py314t-ubuntu, mypyc-compiled	16m 34s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 56s
Test suite with py311-ubuntu	8m 54s
Test suite with py314-ubuntu, mypyc-compiled	13m 53s
Test suite with py310-ubuntu, mypyc-compiled	14m 52s
mypyc runtime tests with py313-macos	7m 26s
mypyc runtime tests with py310-ubuntu	5m 23s
Parallel tests with py314-ubuntu, interpreted	21m 46s
Test suite with py313-ubuntu, mypyc-compiled	14m 28s
	3h 17m 12s

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