### 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
for (int i = get_child_count() - 1; i >= 0; i--) {
		GraphNode *gn = Object::cast_to<GraphNode>(get_child(i));
		if (!gn || gn->is_comment()) {
			continue;
		}
		Vector2 node_position = minimap->_convert_from_graph_position(gn->get_position_offset() * zoom - graph_offset) + minimap_offset;
		Vector2 node_size = minimap->_convert_from_graph_position(gn->get_size() * zoom);
		Rect2 node_rect = Rect2(node_position, node_size);
		Ref<StyleBoxFlat> sb_minimap = minimap->get_theme_stylebox(SNAME("node"))->duplicate();
		
		Ref<StyleBoxFlat> sbf = gn->get_theme_stylebox(gn->is_selected() ? "selected_frame" : "frame");
		if (sbf.is_valid()) {
			Color node_color = sbf->get_border_color();
			sb_minimap->set_bg_color(node_color);
		}
		minimap->draw_style_box(sb_minimap, node_rect);
	}
	
	Color activity_color = get_theme_color(SNAME("activity"));
	for (const Connection &E : connections) {
		Node *from = get_node(NodePath(E.from));
		GraphNode *gfrom = Object::cast_to<GraphNode>(from);
		if (!gfrom) {
			continue;
		}
		Node *to = get_node(NodePath(E.to));
		GraphNode *gto = Object::cast_to<GraphNode>(to);
		if (!gto) {
			continue;
		}