Deprecate the selected_from method

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

src/frequenz/channels/_select.py

@@ -135,6 +135,8 @@
 from collections.abc import AsyncIterator
 from typing import Any, Generic, TypeGuard
 
+from typing_extensions import deprecated
+
 from ._exceptions import Error
 from ._generic import ReceiverMessageT_co
 from ._receiver import Receiver, ReceiverStoppedError
@@ -246,6 +248,7 @@ def __repr__(self) -> str:
 # It would have been nice to be able to make this a method of selected, but sadly
 # `TypeGuard`s can't be used as methods. For more information see:
 # https://github.com/microsoft/pyright/discussions/3125
+@deprecated("Use `Receiver.is_selected()` instead.")
 def selected_from(
     selected: Selected[Any], receiver: Receiver[ReceiverMessageT_co]
 ) -> TypeGuard[Selected[ReceiverMessageT_co]]: