Explore adding QA pipeline on OpenShift cluster

When the initial integration test is added in https://gitlab.com/gitlab-org/gl-openshift/gitlab-operator/-/issues/43, explore adding a job to install GitLab application on the test OpenShift cluster and run gitlab-qa against it.

Additional context

• Follow-up on: https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/748
• Known limitation with SSH access: https://gitlab.com/gitlab-org/gl-openshift/gitlab-operator/-/issues/58