Tests

More precise return types for `TypedDict.get` #18927

Job	Run time
Test mypyc suite with 32-bit Python	8m 39s
Test suite with py312-ubuntu, mypyc-compiled	13m 27s
Test suite with py39-ubuntu, mypyc-compiled	16m 2s
Test suite with py313-windows-64	26m 0s
Test suite with py313-ubuntu, mypyc-compiled	13m 49s
Test suite with py310-ubuntu	11m 9s
Type check our own code (py39-windows-64)	2m 38s
mypyc runtime tests with py39-macos	5m 42s
Test suite with py311-ubuntu	9m 0s
Test suite with py314-dev-ubuntu	16m 42s
Type check our own code (py39-ubuntu)	1m 39s
Formatting and code style with Black + ruff	1m 55s
	2h 6m 42s

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