Interconnection LDAP auth with an OPA authorization

We have LDAP integeration an OPA integration. But currently if both are enabled, the LDAP authentication chain still uses the "allowAll" authorizer.


```[tasklist]
### Tasks
- [ ] Configure the LDAP authentication chain to use the OPA authorizer if OPA is enabled.
```

## Acceptance criteria

- when logging in with LDAP, OPA authorization is used.
