Zanzana: Lazy load cached store info (#96452)

* Lazy load cached store infos

pkg/services/authz/zanzana/server/server_read.go

@@ -13,7 +13,7 @@ func (s *Server) Read(ctx context.Context, req *authzextv1.ReadRequest) (*authze
 	ctx, span := tracer.Start(ctx, "authzServer.Read")
 	defer span.End()
 
-	storeInf, err := s.getNamespaceStore(ctx, req.Namespace)
+	storeInf, err := s.getStoreInfo(ctx, req.Namespace)
 	if err != nil {
 		return nil, err
 	}