NIFI-15958 Log periodic progress while waiting for content archive scan and provenance re-index

[lfrancke]

Summary

Previously these calls blocked indefinitely on a Future.get() call. Now they wake up once a minute to report progress.

• Fixes NIFI-15958
• Related: NIFI-4737

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[exceptionfactory]

Thanks for proposing the incremental logging @lfrancke.

After reviewing this approach, I am concerned about changing the behavior of the future.get() with the new loop.

The goal of providing visibility on incremental progress during re-indexing and archive processing makes sense, so I prepared an alternative approach in PR #11671.

[lfrancke]

Thanks @exceptionfactory - I'll close this PR. Your approach is better than mine!