druid-process module: Test classes do not initialise NullHandling properly resulting in build ERRORS

[sathwik]

There are about 25+ Test classes under druid-processing module which are creating ERRORs during execution.

I have reported the issues and my findings here in this thread.
https://apachedruidworkspace.slack.com/archives/C030CMF6B70/p1700195957478709

This has not been seen till now on the CI build is because of the order of test cases executed which has not picked up the ERROR prone testclasses up in the order.

I have added a shell script on the #dev channel to run the ERROR prone test classes independently and in isolation to demonstrate the problem.

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