Changed node removal behavior so fabric removal is optional (#264)

Author: ArturoGuerra

matter_server/server/device_controller.py

@@ -376,6 +376,8 @@ async def remove_node(self, node_id: int) -> None:
         )
         fabric_index = node.attributes[attribute_path]
 
+        self.server.signal_event(EventType.NODE_DELETED, node_id)
+
         await self.chip_controller.SendCommand(
             nodeid=node_id,
             endpoint=0,
@@ -384,8 +386,6 @@ async def remove_node(self, node_id: int) -> None:
             ),
         )
 
-        self.server.signal_event(EventType.NODE_DELETED, node_id)
-
     async def subscribe_node(self, node_id: int) -> None:
         """
         Subscribe to all node state changes/events for an individual node.