### 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 (!setting_text && idle_detect->is_inside_tree()) {
		idle_detect->start();
	}
	String txt;
	if (undo_enabled) {
		_clear_redo();
		txt = _base_get_text(p_from_line, p_from_column, p_to_line, p_to_column);
	}
	_base_remove_text(p_from_line, p_from_column, p_to_line, p_to_column);
	if (!undo_enabled) {
		return;
	}
	
	TextOperation op;
	op.type = TextOperation::TYPE_REMOVE;
	op.from_line = p_from_line;