NIFI-12857 Add test for and refactor implementation of QueuePrioritizer

[EndzeitBegins]

Summary

Adds test for and refactors implementation of QueuePrioritizer.

NIFI-12857

Additionally, removed some dead code from TestStandardFlowFileQueue.

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Build

• Build completed using mvn clean install -P contrib-check
  • JDK 21

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[exceptionfactory]

@EndzeitBegins can you rebase this PR from the current main branch? It includes some improvements for the build process that should address the last failure in the Static Analysis workflow step.

[EndzeitBegins]

Of course, just rebased on the last commit of main.

[exceptionfactory]

@EndzeitBegins Returning to this PR, I noticed a couple stylistic adjustments needed, but with those and one more rebase, this looks close to completion.

[EndzeitBegins]

Thank you for the review @exceptionfactory.

I've just rebased the PR on the latest commit on main, added the missing line break to the test, and added braces to conditional blocks where they were missing.

I would appreciate another look.

[exceptionfactory]

Thanks @EndzeitBegins! +1 merging