### Godot version

4.1

### System information

Windows

### Issue description

Being able to have multiple cursors similarly to vscode is a great feature, however it's only possible to add carets, not remove them. By left clicking you can remove all extra cursors but you cannot remove a specific one so after selecting multiple lines a single missclick, you have to reselect them all again. Looking at the original pr there was a remove_caret function added so it would make sense to be able to remove carets when clicking again, like in vscode.

![image](https://github.com/godotengine/godot/assets/19669673/3867c00e-9faa-4429-9c6d-f2d6d3883044)


### Steps to reproduce

- Alt click to add multiple carets
- Alt click on the same position again
- Nothing happens

### Minimal reproduction project

N/A
return;
			}
			if (k->is_action("ui_paste", true)) {
				paste();
				accept_event();
				return;
			}
			
			if (k->is_action("ui_undo", true)) {
				undo();
				accept_event();
				return;
			}
			if (k->is_action("ui_redo", true)) {
				redo();
				accept_event();
				return;
			}
			if (k->is_action("ui_text_caret_add_below", true)) {
				add_caret_at_carets(true);
				accept_event();
				return;
			}
			if (k->is_action("ui_text_caret_add_above", true)) {
				add_caret_at_carets(false);
				accept_event();
				return;
			}
		}