[19] No quickfix offered when a switch case is reported to have both unconditional pattern and default label

The following code, when preview is enabled, is reported for an error:

```
int res = switch(r) {
case Rectangle3 r1 -> {
yield 1;
}
default -> 0;
};
```

The error reported is : `Switch case cannot have both unconditional pattern and default label`
However, there's no quickfix provided to remove the default label. It would be helpful for the user to provide one.