Pull Operator image from dev registry in dev CI

When running in CI in the dev.gitlab.org instance, pull the Operator image from the dev registry.

Closes #761 (closed)

Testing

dev

https://dev.gitlab.org/gitlab/cloud-native/gitlab-operator/-/pipelines/258413

$ kubectl get deploy -n a0a4107a-761-ci-dev-registry ga0a4107a-761-ci-dev-registr-controller-manager -oyaml | yq '.spec.template.spec.containers[0].image'
dev.gitlab.org:5005/gitlab/cloud-native/gitlab-operator:a0a4107a

.com

https://gitlab.com/gitlab-org/cloud-native/gitlab-operator/-/pipelines/683950785

$ kubectl get deploy -n a0a4107a-761-ci-dev-registry ga0a4107a-761-ci-dev-registr-controller-manager -oyaml | yq '.spec.template.spec.containers[0].image'
registry.gitlab.com/gitlab-org/cloud-native/gitlab-operator:a0a4107a