Run functional and QA tests for operator on a Kubernetes cluster

We manually verified that the operator can be deployed to Kubernetes in https://gitlab.com/gitlab-org/gl-openshift/gitlab-operator/-/issues/144. This is a followup issue to add jobs to CI that validate the operator on Kubernetes.

Jobs:

• functional_test
• qa
• cleanup

We should be able to use the jobs we already wrote that run against the openshift cluster, since they use kubectl and no OpenShift-specific tools. We should also be able to use the existing CI Kubernetes that charts pipelines use.