Update of unit tests to use KRaft - part 10

[scholzj]

Type of change

• Task

Description

This is another part of the unit test refactoring to better support KRaft. It continues in refactoring the unit tests for the model classes.

• Several tests were just updated to use KRaft as they did not directly depend on ZooKeeper:
  • KafkaExporterTest
  • KafkaClusterOAuthValidationTest
  • KafkaPoolTest
  • ModelUtilsTest
• For several other classes, the tests where split into different classes to separate the ZooKeeper a KRaft based tests. I also made sure the KRaft-based tests provided the same coverage as the ZooKeeper-based tests. This includes:
  • KRaftUtilsTest and KRaftUtilsZooBasedTest
  • KafkaSpecCheckerTest, KafkaSpecCheckerZooBasedTest, and KafkaSpecCheckerZooBasedWithNodePoolsTest
  • NodePoolUtilsTest and NodePoolUtilsZooBasedTest

Checklist

• Write tests
• Make sure all tests pass