### 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
} else {
					String pre_text = _base_get_text(0, 0, get_selection_from_line(), get_selection_from_column());
					String post_text = get_selected_text(0);
					caret_start = pre_text.length();
					caret_end = caret_start + post_text.length();
				}
				DisplayServer::get_singleton()->virtual_keyboard_show(get_text(), get_global_rect(), DisplayServer::KEYBOARD_TYPE_MULTILINE, -1, caret_start, caret_end);
			}
		} break;
		case NOTIFICATION_FOCUS_EXIT: {
			if (caret_blink_enabled) {
				caret_blink_timer->stop();
			}
			if (get_viewport()->get_window_id() != DisplayServer::INVALID_WINDOW_ID && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_IME)) {
				DisplayServer::get_singleton()->window_set_ime_position(Point2(), get_viewport()->get_window_id());
				DisplayServer::get_singleton()->window_set_ime_active(false, get_viewport()->get_window_id());
			}
			if (!ime_text.is_empty()) {
				ime_text = "";
				ime_selection = Point2();
				for (int i = 0; i < carets.size(); i++) {
					text.invalidate_cache(get_caret_line(i), get_caret_column(i), true, ime_text);
				}
			}
			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD) && virtual_keyboard_enabled) {
				DisplayServer::get_singleton()->virtual_keyboard_hide();
			}
			if (deselect_on_focus_loss_enabled && !selection_drag_attempt) {
				deselect();
			}