### 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)

return text_overrun_behavior;
}
bool ItemList::_set(const StringName &p_name, const Variant &p_value) {
	Vector<String> components = String(p_name).split("/", true, 2);
	if (components.size() >= 2 && components[0].begins_with("item_") && components[0].trim_prefix("item_").is_valid_int()) {
		int item_index = components[0].trim_prefix("item_").to_int();
		if (components[1] == "text") {
			set_item_text(item_index, p_value);
			return true;
		} else if (components[1] == "icon") {
			set_item_icon(item_index, p_value);
			return true;
		} else if (components[1] == "disabled") {
			set_item_disabled(item_index, p_value);
			return true;
		} else if (components[1] == "selectable") {
			set_item_selectable(item_index, p_value);
			return true;
		}
	}
#ifndef DISABLE_DEPRECATED
	
	if (p_name == "items") {
		Array arr = p_value;
		ERR_FAIL_COND_V(arr.size() % 3, false);
		clear();
		for (int i = 0; i < arr.size(); i += 3) {
			String text = arr[i + 0];
			Ref<Texture2D> icon = arr[i + 1];