Description of problem:

RHDHBUGS-2159 renamed such named templates in the rhdh-chart repo, but we realized that they might be referenced in user-provided values files.
So they are currently deprecated (not removed) by the Helm Chart and we instead recommend switching to their "rhdh.*" counterparts, as done in the rhdh repo.

Found a few references in the product docs, like:

• https://github.com/redhat-developer/red-hat-developers-documentation-rhdh/blob/main/modules/authentication/proc-authenticationg-with-the-guest-user-on-a-helm-based-installation.adoc?plain=1#L21
• https://github.com/redhat-developer/red-hat-developers-documentation-rhdh/blob/main/modules/configuring-external-databases/proc-configuring-postgresql-instance-using-helm.adoc?plain=1#L114