Enum completions in `new` context should be filtered

## Compiler version
3.4.1
## Minimized code

```Scala
enum NewEnum:
  case Left, Right

new NewEn@@
new NewEnum.Le@@
```
## Output
Both completions requests suggest `NewEnum` and allow us to compile it even if they are illegal and will result in error.
## Expectation

These completions should be hidden as they are illegal in this context.