Duplicate NGINX Plus and docker registry secrets into namespaces where nginx is deployed

[mpstefan]

As a user of NGF
I want NGF to duplicate my secrets necessary for NGF into every namespace where NGINX is deployed
So that the secret can be used in the data plane.

Acceptance

• Any updates to the Secrets in the control plane namespace are propagated to the secrets for all data planes.
• If a user deletes a Secret in the control plane namespace, we delete the associated duplicate secrets in the nginx namespaces