KubeApiPlatformStrategy needs a real AuthManager implementation

[andrewazores]

Currently, the KubeApiPlatformStrategy uses the NoopAuthManager, so any user is able to access ContainerJFR and the only auth layer is target application JMX auth. A new KubeAuthManager should be implemented and used by default for this platform strategy. Most likely this will look very similar to the existing OpenShiftAuthManager.