### Godot version

4.0.dev (d0398f62f0)

### System information

Windows 10

### Issue description

`GraphNode` class declares members with conflicting names.  
- `selected` property: https://github.com/godotengine/godot/blob/0daa86d70e7338506c37bee6b6e0c4aba7255d68/scene/gui/graph_node.cpp#L1154
- `selected` signal: https://github.com/godotengine/godot/blob/0daa86d70e7338506c37bee6b6e0c4aba7255d68/scene/gui/graph_node.cpp#L1164

As now signals are truely members of the class, this leads to name colliding in several languages.  
- In GDScript, the signal can't be used as it is treated as a property:
![image](https://user-images.githubusercontent.com/48322356/210059248-edbbd142-5d34-41f0-a3f5-08d4f2e02fc3.png)
- In Kotlin, the generated API code cannot compile as signal and property declarations are conflicting:
```
e: ~\git\godot\modules\kotlin_jvm\kt\godot-library\src\main\kotlin\godot\gen\godot\GraphNode.kt: (53, 14): Conflicting declarations: public final val selected: Signal0, public final var selected: Boolean
e: ~\git\godot\modules\kotlin_jvm\kt\godot-library\src\main\kotlin\godot\gen\godot\GraphNode.kt: (182, 14): Conflicting declarations: public final val selected: Signal0, public final var selected: Boolean
```

### Steps to reproduce

Try to use `selected` signal from GDScript.

### Minimal reproduction project

N/A
continue;
						}
						previous_selected.push_back(gn2);
					}
				} else {
					box_selection_mode_additive = true;
					previous_selected.clear();
					for (int i = get_child_count() - 1; i >= 0; i--) {
						GraphNode *gn2 = Object::cast_to<GraphNode>(get_child(i));
						if (!gn2) {
							continue;
						}
						gn2->set_selected(false);
					}
				}
			}
		}
		if (b->get_button_index() == MouseButton::LEFT && !b->is_pressed() && box_selecting) {
			
			box_selecting = false;
			box_selecting_rect = Rect2();
			previous_selected.clear();
			top_layer->queue_redraw();
			minimap->queue_redraw();
		}
	}
	if (p_ev->is_pressed()) {
		if (p_ev->is_action("ui_graph_duplicate", true)) {
			emit_signal(SNAME("duplicate_nodes_request"));
			accept_event();