NIFI-13121: Handle runtime exceptions in FetchHDFS

[mattyb149]

Summary

NIFI-13121 This PR mimics the fix from NIFI-6367 that was applied to FetchS3Object, and applies it to FetchHDFS. Runtime exceptions can currently be thrown by the Ozone File System for example.

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[gresockj]

Fix looks good, I see the same strategy is used in FetchS3Object. That test timeout looks to be unrelated to your changes. Thanks @mattyb149