Stop using jenkins-jnlp-agent-himem agent in favor of a Fedora VM for sync tests pipeline against stage.

Current agent lives in an ocp3.11 cluster that is not maintained anymore. Test runners are RHEL that don't support Docker anymore so to start up a galaxy_ng docker environment we need to deploy a Fedora VM and start two containers: an automation_hub instance and the containerized sync tests.

Work done so far:

https://github.com/ansible/aap-jenkins-shared-library/blob/galaxy_ng_sync/vars/aapqaOnPremGalaxyNGSyncTests.groovy

https://github.com/ansible/aap-qa/tree/sync_tests/scripts

https://gitlab.cee.redhat.com/aap-ci/aapqa-provisioner/-/tree/galaxy_ng_sync/

Not much more to be done, just run the script in the remote runner and fetch the generated artifacts to publish the results.