NIFI-12939: Retry Kerberos login on authentication failure in Iceberg processors

[mark-bathori]

Summary

NIFI-12939

Tracking

Please complete the following tracking steps prior to pull request creation.

Issue Tracking

• Apache NiFi Jira issue created

Pull Request Tracking

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

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Build

• Build completed using mvn clean install -P contrib-check
  • JDK 21

Licensing

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Documentation

• Documentation formatting appears as expected in rendered files

[mattyb149]

+1 LGTM, thanks for the improvement! Merging to main and support/nifi-1.x