### 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
int to_col = get_selection_to_column(caret_to_save);
			int selection_line = get_selection_line(caret_to_save);
			int selection_col = get_selection_column(caret_to_save);
			bool at_from = (get_caret_line(caret_to_save) == get_selection_from_line(caret_to_save) && get_caret_column(caret_to_save) == get_selection_from_column(caret_to_save));
			if (at_from) {
				if (get_selection_line(caret_to_remove) > get_selection_line(caret_to_save) || (get_selection_line(caret_to_remove) == get_selection_line(caret_to_save) && get_selection_column(caret_to_remove) >= get_selection_column(caret_to_save))) {
					selection_line = get_selection_line(caret_to_remove);
					selection_col = get_selection_column(caret_to_remove);
				}
			} else if (get_selection_line(caret_to_remove) < get_selection_line(caret_to_save) || (get_selection_line(caret_to_remove) == get_selection_line(caret_to_save) && get_selection_column(caret_to_remove) <= get_selection_column(caret_to_save))) {
				selection_line = get_selection_line(caret_to_remove);
				selection_col = get_selection_column(caret_to_remove);
			}
			if (get_selection_from_line(caret_to_remove) < get_selection_from_line(caret_to_save) || (get_selection_from_line(caret_to_remove) == get_selection_from_line(caret_to_save) && get_selection_from_column(caret_to_remove) <= get_selection_from_column(caret_to_save))) {
				from_col = get_selection_from_column(caret_to_remove);
			} else {
				to_col = get_selection_to_column(caret_to_remove);
			}
			select(from_line, from_col, to_line, to_col, caret_to_save);
			set_selection_mode(selecting_mode, selection_line, selection_col, caret_to_save);
			set_caret_line((at_from ? from_line : to_line), caret_to_save == 0, true, 0, caret_to_save);
			set_caret_column((at_from ? from_col : to_col), caret_to_save == 0, caret_to_save);
			remove_caret(caret_to_remove);
			i--;
			caret_edit_order = get_caret_index_edit_order();
			continue;
		}
		
		if (has_selection(first_caret)) {
			if (get_caret_line(second_caret) >= get_selection_from_line(first_caret) && get_caret_line(second_caret) <= get_selection_to_line(first_caret) && (get_caret_line(second_caret) > get_selection_from_line(first_caret) || get_caret_column(second_caret) >= get_selection_from_column(first_caret)) && (get_caret_line(second_caret) < get_selection_to_line(first_caret) || get_caret_column(second_caret) <= get_selection_to_column(first_caret))) {