### Godot version

4.0.rc6

### System information

Windows 10

### Issue description

Disabled items of an `ItemList` still trigger `item_selected` and `item_activated` signals when using the mouse. Even though the documentation states that:
> Disabled items cannot be selected and do not trigger activation signals (when double-clicking or pressing Enter).

Visually, they are as expected (grayed out and can't grab focus).

-----
This seems to be a recurring problem as it has happened in Godot 2 (#5683) and Godot 3 (#37277) as well.
According to the comments in #37277, PR #37285 (#60123) is supposed to fix it for Godot 4. But it still seems to be an issue.

The PR suggests using `disabled` for rendering and `selectable` for actual selection. If that's the final verdict on the matter, then the documentation should be updated to reflect this.

### Steps to reproduce

1. Create a simple scene.
2. Add an `ItemList` and add several items to it via the Inspector. Disable one or more items.
3. Attach a script to the item list with the following code:
```gdscript
extends ItemList


func _ready() -> void:
	item_activated.connect(_on_item_activated)
	item_selected.connect(_on_item_selected)


func _on_item_activated(item_index: int) -> void:
	prints("Item Activated:", item_index)


func _on_item_selected(item_index: int) -> void:
	prints("Item Selected:", item_index)
```
4. Run the project and try selecting/activating a disabled item.
5. Check the Output console for results.

### Minimal reproduction project

[ItemList_DisabledItem_Bug.zip](https://github.com/godotengine/godot/files/10844570/ItemList_DisabledItem_Bug.zip)

if (auto_height) {
				auto_height_value = ofs.y + max_h + theme_cache.panel_style->get_minimum_size().height;
			}
			scroll_bar->set_max(max);
			scroll_bar->set_page(page);
			if (max <= page) {
				scroll_bar->set_value(0);
				scroll_bar->hide();
			} else {
				scroll_bar->show();
				if (do_autoscroll_to_bottom) {
					scroll_bar->set_value(max);
				}
			}
			break;
		}
	}
	update_minimum_size();
	shape_changed = false;
}
void ItemList::_scroll_changed(double) {
	queue_redraw();
}
void ItemList::_mouse_exited() {
	if (hovered > -1) {
		hovered = -1;
		queue_redraw();
	}
}
int ItemList::get_item_at_position(const Point2 &p_pos, bool p_exact) const {