Part 11 of unit tests update for KRaft

[scholzj]

Step x

Type of change

• Task

Description

This is the part 11 of the unit test refactoring to better support KRaft. This part focuses on the KafkaClusterTest class. It does the following changes:

• The KafkaClusterPodSetTest with StrimziPodSet-based unit tests was merged into the KafkaClusterTest (we anyway don't have any StatefulSet tests anymore anyway, which was the purpose of the separation)
• The original ZooKeeper-based tests are kept in KafkaClusterZooBasedTest.
• The KafkaClusterTest was rewritten to KRaft and to make it smaller, it was split into three classes:
  • KafkaClusterTest with most of the tests
  • KafkaClusterListenersTest with the tests focused on the listeners
  • KafkaClusterStorageTest with the tests arounf storage

Checklist

• Write tests
• Make sure all tests pass

[ppatierno]

LGTM.