### 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
_set_drag_comment_enclosed_nodes(o_gn, comment_enclosed_nodes, true);
						}
					}
				}
			} else {
				if (_filter_input(b->get_position())) {
					return;
				}
				if (panner->is_panning()) {
					return;
				}
				
				box_selecting = true;
				box_selecting_from = b->get_position();
				if (b->is_ctrl_pressed()) {
					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 || !gn2->is_selected()) {
							continue;
						}
						previous_selected.push_back(gn2);
					}
				} else if (b->is_shift_pressed()) {
					box_selection_mode_additive = false;
					previous_selected.clear();
					for (int i = get_child_count() - 1; i >= 0; i--) {
						GraphNode *gn2 = Object::cast_to<GraphNode>(get_child(i));
						if (!gn2 || !gn2->is_selected()) {