Optimize Sonos unjoin behavior when using media_player.unjoin (#74086)

* Coalesce Sonos unjoins to process together

* Refactor for readability

* Skip unjoin call if already ungrouped

* Store unjoin data in a dedicated dataclass

* Revert import adjustment

homeassistant/components/sonos/speaker.py

@@ -906,6 +906,8 @@ class SonosSpeaker:
     @soco_error()
     def unjoin(self) -> None:
         """Unjoin the player from a group."""
+        if self.sonos_group == [self]:
+            return
         self.soco.unjoin()
         self.coordinator = None