### 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 = fixed_icon_size * icon_scale;
			} else {
				minsize = items[i].get_icon_size() * icon_scale;
			}
			if (!items[i].text.is_empty()) {
				if (icon_mode == ICON_MODE_TOP) {
					minsize.y += theme_cache.icon_margin;
				} else {
					minsize.x += theme_cache.icon_margin;
				}
			}
		}
		if (!items[i].text.is_empty()) {
			int max_width = -1;
			if (fixed_column_width) {
				max_width = fixed_column_width;
			} else if (same_column_width) {
				max_width = items[i].rect_cache.size.x;
			}
			items.write[i].text_buf->set_width(max_width);
			Size2 s = items[i].text_buf->get_size();
			if (icon_mode == ICON_MODE_TOP) {
				minsize.x = MAX(minsize.x, s.width);
				if (max_text_lines > 0) {
					minsize.y += s.height + theme_cache.line_separation * max_text_lines;
				} else {
					minsize.y += s.height;
				}
			} else {
				minsize.y = MAX(minsize.y, s.height);