Prow CI: Upgrade config not using predefined steps about ci-artifacts

[kpouget]

From discussion with the testplatform team:

that won't verify distruption. I think you want openshift-e2e-test with TEST_TYPE=upgrade

    test:
    - ref: openshift-e2e-test
    dependencies:
      OPENSHIFT_INSTALL_RELEASE_IMAGE_OVERRIDE: "release:initial"
      OPENSHIFT_UPGRADE_RELEASE_IMAGE_OVERRIDE: "release:latest"
    env:
      TEST_TYPE: upgrade
      TEST_SUITE: ""
      TEST_UPGRADE_OPTIONS: ""
      DELETE_MC: "false"

==> I (@kpouget ) think that this cannot work because of point 1 in the issue description

[kpouget]

From discussion with the testplatform team:

There's however openshift-upgrade-aws workflow, which only does the cluster update. I think you can hack test chain in it and add install / verification steps

(that'd allow us to have all features of standard cluster upgrade like disruption tests and Loki integration)

in the worst case you can create your own workflow, copy openshift-upgrade-aws and add install / validation steps to "test" chain

==> that should be further investigated