Repo still refers to old Docker image in places

[coro]

Describe the bug

The repo references the old Docker image rabbitmqoperator/rabbitmq-cluster-kubernetes-operator-dev and rabbitmqoperator/rabbitmq-cluster-kubernetes-operator in places, which were replaced by rabbitmqoperator/cluster-operator-dev and rabbitmqoperator/cluster-operator, respectively.

Expected behavior
I would expect both of these image names to be replaced with the new image name. It would be worth investigating where in our repo & tooling the old image is referenced, then updating to the new image name.

Additional context

Once these deletions are made, we can remove the old images from Dockerhub.

[ChunyiLyu]

Remember to update this file as it uses the docker image as a placeholder string when using kustomize edit image: https://github.com/pivotal/rabbitmq-for-kubernetes-ci/blob/master/tasks/operator-system-tests/task.yml

[Zerpet]

After https://github.com/pivotal/rabbitmq-for-kubernetes-ci/commit/a0a8cd994494048873add181f82390934bcab46e, this issue can be closed.