Fix: Applying object transform can create normal layers

Because this operator is used on original objects, it's best to tag
the normals dirty instead of explicitly calculating them, to avoid
unnecessarily storing normal layers on an original object (since
they might have to be recalculated during evaluation anyway).
There may be other places this change is helpful, but being
conservative is likely better for now.

Related to T95125

source/blender/editors/object/object_transform.c

@@ -811,8 +811,8 @@ static int apply_objects_internal(bContext *C,
       /* adjust data */
       BKE_mesh_transform(me, mat, true);
 
-      /* update normals */
-      BKE_mesh_calc_normals(me);
+      /* If normal layers exist, they are now dirty. */
+      BKE_mesh_normals_tag_dirty(me);
     }
     else if (ob->type == OB_ARMATURE) {
       bArmature *arm = ob->data;