NIFI-10499: Allow passing AWS region to AWS Processors via flow file attributes

[grishick]

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Summary

NIFI-10499

I made this change in Anetac's Nifi fork months ago and we are using it in production.

Tracking

Issue Tracking

• [x] Apache NiFi Jira issue created

Pull Request Tracking

• [x] Pull Request title starts with Apache NiFi Jira issue number, such as NIFI-10499
• [ x Pull Request commit message starts with Apache NiFi Jira issue number, as such NIFI-10499

Pull Request Formatting

• [x] Pull Request based on current revision of the support/nifi.1x branch
• [x] Pull Request refers to a feature branch with one commit containing changes

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Build

• [x] Build completed using mvn clean install -P contrib-check
  • [x] JDK 21
  • [x] JDK 8

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• [x] New dependencies are documented in applicable LICENSE and NOTICE files

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