[Security] Add check for supported attributes in AclVoter

```
| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | no
| Fixed tickets | 
| License       | MIT
| Doc PR        | 
```

Couldn't get the tests to pass but the issues where unrelated to change.

This fixes issues with Attribute containing ExpressionLanguage instance when using allow_if.