### 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
_remove_text(get_caret_line(caret_idx), 0, get_caret_line(caret_idx), caret_current_column);
			adjust_carets_after_edit(caret_idx, get_caret_line(caret_idx), caret_current_column, get_caret_line(caret_idx), get_caret_column(caret_idx));
			
			for (int j = i + 1; j < caret_edit_order.size(); j++) {
				
				if (has_selection(caret_edit_order[j]) && get_selection_from_line(caret_edit_order[j]) != get_caret_line(caret_idx) && get_selection_to_line(caret_edit_order[j]) == get_caret_line(caret_idx)) {
					carets.write[caret_edit_order[j]].selection.to_column = 0;
					break;
				}
				
				if (get_caret_line(caret_edit_order[j]) != get_caret_line(caret_idx) || (has_selection(caret_edit_order[j]) && get_selection_from_line(caret_edit_order[j]) != get_caret_line(caret_idx))) {
					break;
				}
				deselect(caret_edit_order[j]);
				carets_to_remove.push_back(caret_edit_order[j]);
				set_caret_column(0, caret_idx == 0, caret_idx);
				i = j;
			}
			continue;
		}
		if (p_word) {
			
			int from_column = get_caret_column(caret_idx);
			int column = get_caret_column(caret_idx);
			
			
			if (is_whitespace(text[get_caret_line(caret_idx)][get_caret_column(caret_idx) - 1])) {
				column -= 1;
			}