NIFI-10774 fix flaky tests in TestGetHDFSFileInfo

[YiweiLi4]

Summary

NIFI-10774
testRecursiveGroupAllToAttributes is detected flaky by Nondex since the attribute "hdfs.full.tree" is a JSON Object and is not always written in a deterministic order. Instead of comparing the string of the attribute and the expected one, I used jsonassert to compare the two JSON objects.

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[pvillard31]

I'd try to achieve the same without introducing an additional dependency. Or at the very least, change the scope of the dependency for testing only.

[exceptionfactory]

@YiweiLi4 Thanks for the contribution, as previously these test changes should be implemented without the additional dependency. I am closing this pull request for now, but feel free to follow up after making the requested changes when you are ready for further review.