### 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
ERR_FAIL_COND(p_ev.is_null());
	if (panner->gui_input(p_ev, warped_panning ? get_global_rect() : Rect2())) {
		return;
	}
	Ref<InputEventMouseMotion> mm = p_ev;
	if (mm.is_valid() && dragging) {
		if (!moving_selection) {
			emit_signal(SNAME("begin_node_move"));
			moving_selection = true;
		}
		just_selected = true;
		drag_accum += mm->get_relative();
		for (int i = get_child_count() - 1; i >= 0; i--) {
			GraphNode *gn = Object::cast_to<GraphNode>(get_child(i));
			if (gn && gn->is_selected() && gn->is_draggable()) {
				Vector2 pos = (gn->get_drag_from() * zoom + drag_accum) / zoom;
				
				
				if (is_using_snap() ^ Input::get_singleton()->is_key_pressed(Key::CTRL)) {
					const int snap = get_snap();
					pos = pos.snapped(Vector2(snap, snap));
				}
				gn->set_position_offset(pos);
				if (gn->is_comment()) {
					_set_position_of_comment_enclosed_nodes(gn, comment_enclosed_nodes, drag_accum);
				}
			}
		}
	}