AllNamespaces API Key test is now irrelevant

[jsmolar]

Summary

Kuadrant creates all AuthConfigs in the same namespace where Authorino is running. Therefore we changed default value for spec.authentication.apiKey.allNamespaces to True. This makes test_all_namespaces_api_key.py irrelevant.

Refactor/remove this test and implement one that creates a secret in the same namespace as Authorino.

authorino-standalone is not affected, but needs to be think of when implementing this issue