### 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
} break;
		case MainLoop::NOTIFICATION_OS_IME_UPDATE: {
			if (has_focus()) {
				ime_text = DisplayServer::get_singleton()->ime_get_text();
				ime_selection = DisplayServer::get_singleton()->ime_get_selection();
				if (!ime_text.is_empty() && has_selection()) {
					delete_selection();
				}
				for (int i = 0; i < carets.size(); i++) {
					String t;
					if (get_caret_column(i) >= 0) {
						t = text[get_caret_line(i)].substr(0, get_caret_column(i)) + ime_text + text[get_caret_line(i)].substr(get_caret_column(i), text[get_caret_line(i)].length());
					} else {
						t = ime_text;
					}
					text.invalidate_cache(get_caret_line(i), get_caret_column(i), true, t, structured_text_parser(st_parser, st_args, t));
				}
				queue_redraw();
			}
		} break;
		case NOTIFICATION_DRAG_BEGIN: {
			selecting_mode = SelectionMode::SELECTION_MODE_NONE;
			drag_action = true;
			dragging_minimap = false;
			dragging_selection = false;
			can_drag_minimap = false;
			click_select_held->stop();
		} break;
		case NOTIFICATION_DRAG_END: {
			if (is_drag_successful()) {