NIFI-13937 - NiFi CLI - Add command pg-empty-queues

[pvillard31]

Summary

NIFI-13937 - NiFi CLI - Add command pg-empty-queues

./bin/cli.sh nifi pg-empty-queues -p nifi-cli.properties -pgid 9a70ab3e-0192-1000-af96-cd5914b70181

./bin/cli.sh nifi pg-empty-queues -p nifi-cli.properties -pgid b5e0eb3a-0192-1000-6996-53ab1c85211b --verbose
Emptying queues, currently at 0% (1 of 20)...
Emptying queues, currently at 23% (2 of 20)...
Emptying queues, currently at 50% (3 of 20)...
Emptying queues, currently at 79% (4 of 20)...
Drop request completed. Deleted: 484,282 / 0 bytes

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

Pull Request Formatting

• Pull Request based on current revision of the main branch
• Pull Request refers to a feature branch with one commit containing changes

Verification

Please indicate the verification steps performed prior to pull request creation.

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
• New dependencies are documented in applicable LICENSE and NOTICE files

Documentation

• Documentation formatting appears as expected in rendered files

[exceptionfactory]

Thanks for the addition @pvillard31, the implementation looks good with the bounded status checks for emptying queues. +1 merging