### 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 (!search_string.is_empty()) {
				uint64_t now = OS::get_singleton()->get_ticks_msec();
				uint64_t diff = now - search_time_msec;
				if (diff < uint64_t(GLOBAL_GET("gui/timers/incremental_search_max_interval_msec")) * 2) {
					for (int i = current + 1; i < items.size(); i++) {
						if (CAN_SELECT(i) && items[i].text.begins_with(search_string)) {
							set_current(i);
							ensure_current_is_visible();
							if (select_mode == SELECT_SINGLE) {
								emit_signal(SNAME("item_selected"), current);
							}
							break;
						}
					}
					accept_event();
					return;
				}
			}
			if (current < items.size() - current_columns) {
				int next = current + current_columns;
				while (next < items.size() && !CAN_SELECT(next)) {
					next = next + current_columns;
				}
				if (next >= items.size()) {
					accept_event();
					return;
				}
				set_current(next);
				ensure_current_is_visible();
				if (select_mode == SELECT_SINGLE) {