unistore: fix delete and db closed in kv store (#107918)

* fix delete and db closed

* fix tests

pkg/storage/unified/resource/server.go

@@ -782,6 +782,11 @@ func (s *server) delete(ctx context.Context, user claims.AuthInfo, req *resource
 		return nil, apierrors.NewBadRequest(
 			fmt.Sprintf("unable to read previous object, %v", err))
 	}
+	oldObj, err := utils.MetaAccessor(marker)
+	if err != nil {
+		return nil, err
+	}
+
 	obj, err := utils.MetaAccessor(marker)
 	if err != nil {
 		return nil, err
@@ -793,6 +798,8 @@ func (s *server) delete(ctx context.Context, user claims.AuthInfo, req *resource
 	obj.SetUpdatedBy(user.GetUID())
 	obj.SetGeneration(utils.DeletedGeneration)
 	obj.SetAnnotation(utils.AnnoKeyKubectlLastAppliedConfig, "") // clears it
+	event.ObjectOld = oldObj
+	event.Object = obj
 	event.Value, err = marker.MarshalJSON()
 	if err != nil {
 		return nil, apierrors.NewBadRequest(