### 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
List<List<Connection>::Element *> to_erase;
	for (List<Connection>::Element *E = connections.front(); E; E = E->next()) {
		const Connection &c = E->get();
		Node *from = get_node(NodePath(c.from));
		GraphNode *gfrom = Object::cast_to<GraphNode>(from);
		if (!gfrom) {
			to_erase.push_back(E);
			continue;
		}
		Node *to = get_node(NodePath(c.to));
		GraphNode *gto = Object::cast_to<GraphNode>(to);
		if (!gto) {
			to_erase.push_back(E);
			continue;
		}
		Vector2 frompos = gfrom->get_connection_output_position(c.from_port) + gfrom->get_position_offset() * zoom;
		Color color = gfrom->get_connection_output_color(c.from_port);
		Vector2 topos = gto->get_connection_input_position(c.to_port) + gto->get_position_offset() * zoom;
		Color tocolor = gto->get_connection_input_color(c.to_port);
		if (c.activity > 0) {
			color = color.lerp(activity_color, c.activity);
			tocolor = tocolor.lerp(activity_color, c.activity);
		}
		_draw_connection_line(connections_layer, frompos, topos, color, tocolor, lines_thickness, zoom);
	}
	for (List<Connection>::Element *&E : to_erase) {
		connections.erase(E);
	}
}
void GraphEdit::_top_layer_draw() {