Add note to avoid using redis subchart dependency if the deployment is used in production

We are currently outputting an error in regard to GitLab if postgresql is enabled that states the following

{{ if $.Values.addons.gitlab.database.host }}
{{ else }}
PLATFORM ONE GITLAB WARNING:
  You have enabled an internal postgres database in the BigBang configuration.
  Platform One does not support this option for production deployments because your persistent data can be permanently lost.
  This option should only be used for development or CI pipelines.
{{- end -}}

We need to have something similar added for Redis.

The following applications use redis:

Authservice
Redis
Gitlaab-ci-pipelines-exporter
Argocd
Renovate
Harbor
Gitlab