[feature] configure configmap name and namespace

Some deployments out there are in a different namespace than the default. There needs to be a way to configure that when launching the operator. maybe through env vars, cli param or a file mounted to the operator container

_Originally posted by @sbeginCoveo in https://github.com/argoproj-labs/argocd-rbac-operator/pull/1#discussion_r1635103460_
            