Change OCP 4 and OCP 3 migration workloads to use downstream deploys (#1043)
* Add OCP 4 workload migration role changes for OLM deploy
* Add OCP 3 workload migration role changes for OLM deploy
* Change migration workloads to use k8s module idempotently
* Remove outdated tasks from ocp migration role, update demo directory
* Add MigrationController create task to CAM migration role
* Fix ocp-workload-migration deploy issues
* Update migration workload docs to reflect version upgrade
* Templatize migration namespace in ocp migration workload
* Update ocp-workload-migration doc to reference removal of vars
* Fix docs typos and missing newline in ocp-workload-migration