typing_extensions.TypeForm should re-export typing.TypeForm on python 3.15 #16463

# some library i use that needs to work on older python versions:
import typing_extensions
def fn[T](typ: typing_extensions.TypeForm[T]): ...


# my project that uses python 3.15
import typing
typ: typing.TypeForm[int | None] = int | None

fn(typ) # error:  "TypeForm[int | None]" is not assignable to "TypeForm[T@fn]"

if sys.version_info >= (3, 15):
    from typing import TypeForm as TypeForm
else:
    TypeForm: _SpecialForm