Fix flake tests under asan
ShapeGroupContainerModel::remove() will call KoShapeGroup::invalidateSizeCache(), even when the shape group is going to be destroyed. This method is called after KoShapeGroup's destructor, so at this time we no longer have access to members of KoShapeGroup, i.e. its d-pointer. So this call will cause access violation as the instance `QScopedPointer<Private> d` in KoShapeGroup has already been destroyed. This is a result of getting rid of derived d-pointers, because if we use a derived d-pointer, it only gets destroyed in the ancestor class (KoShape). We temporarily fix this problem by manually call `model()->deleteOwnedShapes()` in KoShapeGroup's destructor.
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