### 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 (p_last_fit_x == -1) {
		p_last_fit_x = _get_column_x_offset_for_line(p_old_column, p_old_line, p_old_column);
	}
	
	p_new_line = p_old_line;
	int caret_wrap_index = p_old_wrap_index;
	if (p_below) {
		if (caret_wrap_index < get_line_wrap_count(p_new_line)) {
			caret_wrap_index++;
		} else {
			p_new_line++;
			caret_wrap_index = 0;
		}
	} else {
		if (caret_wrap_index == 0) {
			p_new_line--;
			caret_wrap_index = get_line_wrap_count(p_new_line);
		} else {
			caret_wrap_index--;
		}