### 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
if (selection_drag_attempt) {
					selection_drag_attempt = false;
					if (is_editable() && !Input::get_singleton()->is_key_pressed(Key::CTRL)) {
						delete_selection();
					} else if (deselect_on_focus_loss_enabled) {
						deselect();
					}
				}
			} else {
				selection_drag_attempt = false;
			}
			drag_action = false;
			drag_caret_force_displayed = false;
		} break;
	}
}
void TextEdit::unhandled_key_input(const Ref<InputEvent> &p_event) {
	Ref<InputEventKey> k = p_event;
	if (k.is_valid()) {
		if (!k->is_pressed()) {
			return;
		}
		
		if (has_focus() && editable && (k->get_unicode() >= 32)) {
			handle_unicode_input(k->get_unicode());
			accept_event();
		}
	}
}
bool TextEdit::alt_input(const Ref<InputEvent> &p_gui_input) {