### 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)

minsize.x += s.width;
			}
		}
		if (fixed_column_width > 0) {
			minsize.x = fixed_column_width;
		}
		max_column_width = MAX(max_column_width, minsize.x);
		
		minsize.y += theme_cache.v_separation;
		minsize.x += theme_cache.h_separation;
		items.write[i].rect_cache.size = minsize;
		items.write[i].min_rect_cache.size = minsize;
	}
	int fit_size = size.x - theme_cache.panel_style->get_minimum_size().width - scroll_bar_minwidth;
	
	current_columns = 0x7FFFFFFF;
	if (max_columns > 0) {
		current_columns = max_columns;
	}
	
	while (true) {
		bool all_fit = true;
		Vector2 ofs;
		int col = 0;
		int max_h = 0;
		separators.clear();
		for (int i = 0; i < items.size(); i++) {
			if (current_columns > 1 && items[i].rect_cache.size.width + ofs.x > fit_size) {
				
				current_columns = MAX(col, 1);