add to list of beta features

Author: micheleRP

modules/get-started/pages/cloud-overview.adoc

@@ -389,6 +389,7 @@ The following features are currently in beta in Redpanda Cloud:
 * Remote Read Replicas for AWS and GCP 
 * Redpanda Cloud MCP Server
 * Several Redpanda Connect components 
+* User impersonation for unified authentication and authorization between Redpanda Cloud and Redpanda
 
 == Next steps
 * xref:manage:maintenance.adoc[Learn about upgrades and maintenance]