### 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
bool draw_placeholder = text.size() == 1 && text[0].length() == 0;
		int v_scroll_i = floor(get_v_scroll());
		int sc = 0;
		int n_line;
		for (n_line = 0; n_line < text.size(); n_line++) {
			if (!_is_line_hidden(n_line)) {
				sc++;
				sc += draw_placeholder ? placeholder_wraped_rows.size() - 1 : get_line_wrap_count(n_line);
				if (sc > v_scroll_i) {
					break;
				}
			}
		}
		n_line = MIN(n_line, text.size() - 1);
		int line_wrap_amount = draw_placeholder ? placeholder_wraped_rows.size() - 1 : get_line_wrap_count(n_line);
		int wi = line_wrap_amount - (sc - v_scroll_i - 1);
		wi = CLAMP(wi, 0, line_wrap_amount);
		first_visible_line = n_line;
		first_visible_line_wrap_ofs = wi;
	}
	queue_redraw();
}
double TextEdit::_get_visible_lines_offset() const {
	double total = _get_control_height();
	total /= (double)get_line_height();
	total = total - floor(total);
	total = -CLAMP(total, 0.001, 1) + 1;
	return total;
}
double TextEdit::_get_v_scroll_offset() const {