Add test for Unprivileged OpenJ9 CRIU

Unprivileged OpenJ9 CRIU Support blog: https://blog.openj9.org/2022/09/29/unprivileged-openj9-criu-support/
Test scenario:
- start container with `privileged`
- create checkpoint
- upload test image
- start container with `unprivileged` (on different machines)
- perform `unprivileged` CRIU restore

@Tobi could you confirm the test scenario? Is this test limited on Ubuntu 22 only? Do we need to run podman?

FYI @llxia @smlambert

Start with the linked OpenJ9 unprivileged CRIU support blog and resolve the scenario questions in the issue: Ubuntu 22 support, Podman requirements, and cross-machine execution. Define the test around privileged checkpoint creation, test-image upload, and unprivileged restore before adding it to the AQA tests.

Written by the indexing model from the issue text.