### 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 (is_move_caret_on_right_click_enabled()) {
					if (has_selection()) {
						for (int i = 0; i < get_caret_count(); i++) {
							int from_line = get_selection_from_line(i);
							int to_line = get_selection_to_line(i);
							int from_column = get_selection_from_column(i);
							int to_column = get_selection_to_column(i);
							if (row >= from_line && row <= to_line && (row != from_line || col >= from_column) && (row != to_line || col <= to_column)) {
								
								selection_clicked = true;
								break;
							}
						}
					}
					if (!selection_clicked) {
						deselect();
						remove_secondary_carets();
						set_caret_line(row, false, false);
						set_caret_column(col);
					}
					merge_overlapping_carets();
				}
				if (context_menu_enabled) {
					_update_context_menu();
					menu->set_position(get_screen_position() + mpos);
					menu->reset_size();
					menu->popup();
					grab_focus();
				}
			}