### 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 (caret_column != new_caret_column) {
				int _; 
				_get_above_below_caret_line_column(caret_line, get_caret_wrap_index(caret_index), caret_from_column, p_below, _, new_caret_from_column);
				_get_above_below_caret_line_column(caret_line, get_caret_wrap_index(caret_index), caret_to_column, p_below, _, new_caret_to_column);
			} else {
				new_caret_from_column = caret_from_column;
				new_caret_to_column = caret_to_column;
			}
		}
		
		const int new_caret_index = add_caret(new_caret_line, new_caret_column);
		if (new_caret_index == -1) {
			continue;
		}
		
		if (new_caret_from_column != new_caret_to_column) {
			select(new_caret_line, new_caret_from_column, new_caret_line, new_caret_to_column, new_caret_index);
			
			carets.write[new_caret_index].selection.selecting_line = new_caret_line;
			carets.write[new_caret_index].selection.selecting_column = new_caret_column == new_caret_from_column ? new_caret_to_column : new_caret_from_column;
			continue;
		}
		
		carets.write[new_caret_index].last_fit_x = carets[caret_index].last_fit_x;
	}
	merge_overlapping_carets();
	queue_redraw();
}
Vector<int> TextEdit::get_caret_index_edit_order() {