### 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
setting_text = true;
	if (!undo_enabled) {
		_clear();
		insert_text_at_caret(p_text);
	}
	if (undo_enabled) {
		remove_secondary_carets();
		set_caret_line(0);
		set_caret_column(0);
		begin_complex_operation();
		deselect();
		_remove_text(0, 0, MAX(0, get_line_count() - 1), MAX(get_line(MAX(get_line_count() - 1, 0)).size() - 1, 0));
		insert_text_at_caret(p_text);
		end_complex_operation();
	}
	set_caret_line(0);
	set_caret_column(0);
	queue_redraw();
	setting_text = false;
	emit_signal(SNAME("text_set"));
}
String TextEdit::get_text() const {