`NoReturn` on `__new__` and `__init__` disables accessing `@classmethod`s and `ClassVar`s directly from the class

Bug Report

Annotating __new__(...) -> typing.NoReturn or __init__(...) -> typing.NoReturn causes false positives when accessing @classmethods and typing.ClassVar-annotated attributes.

To Reproduce

from typing import NoReturn, Any, ClassVar

class A:
    attr: ClassVar[str] = ""
    def __init__(cls, *args: Any, **kwargs: Any) -> NoReturn:
        raise RuntimeError
    @classmethod
    def f(cls) -> None:
        pass

class B:
    attr: ClassVar[str] = ""
    @classmethod
    def f(cls) -> None:
        pass

Expected Behavior

No issues on any of the following:

A.f()
A.attr
B.f()
B.attr

Actual Behavior

A.f()  # mypy: "Callable[[VarArg(Any), KwArg(Any)], NoReturn]" has no attribute "f"  [attr-defined]
A.attr  # mypy: "Callable[[VarArg(Any), KwArg(Any)], NoReturn]" has no attribute "attr"  [attr-defined]
B.f()
B.attr

Your Environment

• Mypy version used: 0.990 and master branch of https://mypy-play.net/
• Mypy command-line flags: None
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: 3.10

Beginne mit dem bereitgestellten Python-Reproducer und verfolge, wie mypy Klassen repräsentiert, deren new oder init NoReturn zurückgibt. Füge Regressionstests für den Zugriff auf classmethod und ClassVar hinzu und stelle sicher, dass A.f(), A.attr, B.f() und B.attr keine Probleme verursachen.