Dockerize integ-test notification and gradle-check flaky test detector

[gaiksaya]

Is your feature request related to a problem? Please describe

The below jenkins workflows are running directly on the container.
https://github.com/opensearch-project/opensearch-build/blob/main/jenkins/gradle/gradle-check-flaky-test-issue-creation.jenkinsfile
https://github.com/opensearch-project/opensearch-build/blob/main/jenkins/integ-test-notification.jenkinsfile

Describe the solution you'd like

We should use docker images instead for easy clean up and uniform CI environment.

Describe alternatives you've considered

No response

Additional context

No response