Prevents the following error when deleting an AssetResource via the
Valkyrie Transactions:

`SolrDocument#get_members: undefined method 'members' for AssetResource`

Setting the validation status required looking up the Asset's members
recursively. But since we're in the middle of deleting things:

1. Expected data was missing, and more importantly,
2. We don't care about setting the Asset's validation status because
   it's being deleted

The Transaction ensures the members will be deleted thoroughly. For
example, using the transaction means all the related Sipity records will
be destroyed, which is what we want

This should fix specs that are failing in CI