Remove nearly all __str__ and __repr__ methods from typeshed (#6968)

stubs/protobuf/google/protobuf/internal/containers.pyi

@@ -18,7 +18,6 @@ class BaseContainer(Sequence[_T]):
     def __len__(self) -> int: ...
     def __ne__(self, other: object) -> bool: ...
     def __hash__(self) -> int: ...
-    def __repr__(self) -> str: ...
     def sort(self, *, key: Optional[Callable[[_T], Any]] = ..., reverse: bool = ...) -> None: ...
     @overload
     def __getitem__(self, key: SupportsIndex) -> _T: ...