Security examples missing KRaft setup

The examples in https://github.com/confluentinc/confluent-kubernetes-examples/tree/master/security are a great way to point to a concrete setup. However, all examples are still using ZK.

We should also have them with KRaft Controllers.

Start in the security examples directory linked in the issue and review the existing ZooKeeper-based setups. Identify the example coverage that needs KRaft Controllers and add equivalent KRaft setups; done means the security examples include working KRaft Controller configurations alongside the existing examples.

Written by the indexing model from the issue text.