Until downstream is ready to use the "app.kubernetes.io/name" selector,
continue to use the "control-plane" selector in the tests.

Change the network-policies to use a "control-plane" selector (which is still
on pods because the Deployment selector is immutable).

This includes a revert of "Use old and new pod selectors during kustomize-to-helm transition"
This reverts operator-framework#2214
This reverts commit 6e22e2b.