remove unneeded functions from list class in fixture

Author: lincolnq

test-data/unit/fixtures/f_string.pyi

@@ -18,12 +18,7 @@ class list(Iterable[T], Generic[T]):
     def __init__(self) -> None: pass
     @overload
     def __init__(self, x: Iterable[T]) -> None: pass
-    def __iter__(self) -> Iterator[T]: pass
-    def __add__(self, x: list[T]) -> list[T]: pass
-    def __mul__(self, x: int) -> list[T]: pass
-    def __getitem__(self, x: int) -> T: pass
     def append(self, x: T) -> None: pass
-    def extend(self, x: Iterable[T]) -> None: pass
 
 class tuple(Generic[T]): pass