Provide access to WorkloadCluster logs from the management cluster
Summary
Following !4598 (merged) , we can no longer see the workload cluster's log in the Grafana from management cluster. I've raised #2552 (closed) to set loki as datasource in the workload clusters so that users of that cluster be able to view the logs, however it would be nice to still be able to see them from the management cluster Grafana instance . This would basically just need a way to add some new loki datasources to Grafana.