Exposing _nodes/usage in serverless (#95585)

This exposes _nodes/usage as internal in serverless mode because it is
used for telemetry.

server/src/main/java/org/elasticsearch/rest/action/admin/cluster/RestNodesUsageAction.java

@@ -16,6 +16,8 @@ import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.RestResponse;
 import org.elasticsearch.rest.RestStatus;
+import org.elasticsearch.rest.Scope;
+import org.elasticsearch.rest.ServerlessScope;
 import org.elasticsearch.rest.action.RestActions;
 import org.elasticsearch.rest.action.RestBuilderListener;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -27,6 +29,7 @@ import java.util.Set;
 
 import static org.elasticsearch.rest.RestRequest.Method.GET;
 
+@ServerlessScope(Scope.INTERNAL)
 public class RestNodesUsageAction extends BaseRestHandler {
 
     @Override