NIFI-12840 Expose REMOTE_POLL_BATCH_SIZE property for ListSFTP (backport for 1.x)

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Summary

This is a backport of NIFI-12772 / #8390 for NiFi 1.x.

NIFI-12840

Tracking

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Issue Tracking

• Apache NiFi Jira issue created

Pull Request Tracking

• Pull Request title starts with Apache NiFi Jira issue number, such as NIFI-00000
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Build

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  • JDK 21 8

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