NIFI-9096-9103 Multiple JUnit 5 refactorings (Beats -> Datadog)

[MikeThomsen]

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Enables X functionality; fixes bug NIFI-YYYY.

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[exceptionfactory]

Thanks for breaking down these changes into smaller groups @MikeThomsen, this should help the overall progress. Planning to review soon.

[exceptionfactory]

This looks good, thanks @MikeThomsen!

The CaptureChangeMySQLTest.groovy replaced explicit imports with wildcard imports in a couple cases, but that appears to the be only instance, so I will correct it when merging.