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Fix TypeIs narrowing to NewType - #22179
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Diff from mypy_primer, showing the effect of this PR on open source code: scipy-stubs (https://github.com/scipy/scipy-stubs)
- tests/misc/test_submodules_empty.pyi:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
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Fixes #22175
Preserve
NewTypetargets when narrowing throughTypeIs. Runtimeisinstancechecks still eraseNewTypeto its base because they cannot distinguish the wrapper, while an explicitTypeIspredicate can now narrow to the declaredNewType.Adds regression coverage for both the positive and negative branches.