Spec and conformance tests disagree on converting constructors into callable for classes with `__new__` and `__init__`

[fangyi-zhou]

For classes with both __new__ and __init__, when converting the constructor into a Callable, the spec says that

https://github.com/python/typing/blame/20096eeba502b1bf955fcf62b389adbaa63fc61b/docs/spec/constructors.rst#L457

    class B:
        """ __new__ and __init__ """
        def __new__(cls, *args, **kwargs) -> Self:
            ...

        def __init__(self, x: int) -> None:
            ...

    reveal_type(accepts_callable(B))  # ``def (*args, **kwargs) -> B | def (x: int) -> B``

The conformance test says that

typing/conformance/tests/constructors_callable.py

Lines 54 to 64 in 20096ee

	class Class3:
	"""__new__ and __init__"""
	def __new__(cls, *args, **kwargs) -> Self:
	raise NotImplementedError
	def __init__(self, x: int) -> None: ...
	r3 = accepts_callable(Class3)
	reveal_type(r3) # `def (x: int) -> Class3`