NIFI-13372 Add processor DeleteSFTP

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Summary

Adds new processor DeleteSFTP to the bundle standard-processors.

See issue NIFI-13372 for the motivation behind the addition.

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
• 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

• New dependencies are compatible with the Apache License 2.0 according to the License Policy
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Documentation

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I just noticed that ListSFTP unlike ListFile does not populate both path and absolute.path but only path instead.

I'll adjust the PR accordingly.

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PR adjusted accordingly.
The implementation is inspired by both that of DeleteFile and PutSFTP.

I would appreciate a review. 🙂

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Based on this discussion I added a commit that removes the addition of exception details as FlowFile attributes.

I also rebased on main as several commits were merged since this PR was opened.