Enable support for shared resources

[Allex1]

I think we should introduce the shared resource concept between clusters . I'm thinking here of hosts that are deployed in admin cluster and need to be used in the product cluster. For example Prometheus servers even if they are part of admin cluster when deploying the product artefacts we should find a way to deploy new alerts/recording rules as well without changing the cluster/playbook or run it twice against 2 different clusters.