NIFI-10409 - adjust nifi-enrich-processors unit tests to handle ISP d…

[greyp9]

…nserrorassist behavior

Leverage MockitoStatic to override test usage of DNS lookup with mocked behavior that aligns with expectations.

Summary

NIFI-10409

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[greyp9]

https://github.com/greyp9/nifi/actions/runs/2950968199

[exceptionfactory]

Thanks for the improvement @greyp9, this looks like a good approach to make the test more robust across build environments! +1 merging