sa: get order names from authorizations (letsencrypt#7435)

This removes the only place we query the requestedNames table, which
allows us to get rid of it in a subsequent PR (once this one is merged
and deployed).

Part of letsencrypt#7432

sa/sa.go

@@ -549,7 +549,24 @@ func (ssa *SQLStorageAuthority) NewOrderAndAuthzs(ctx context.Context, req *sapb
 			return nil, err
 		}
 
-		// Fourth, insert the FQDNSet entry for the order.
+		// Fourth, insert all of the requestedNames.
+		// TODO(#7432): Remove this
+		inserter, err = db.NewMultiInserter("requestedNames", []string{"orderID", "reversedName"}, "")
+		if err != nil {
+			return nil, err
+		}
+		for _, name := range req.NewOrder.Names {
+			err := inserter.Add([]interface{}{orderID, ReverseName(name)})
+			if err != nil {
+				return nil, err
+			}
+		}
+		_, err = inserter.Insert(ctx, tx)
+		if err != nil {
+			return nil, err
+		}
+
+		// Fifth, insert the FQDNSet entry for the order.
 		err = addOrderFQDNSet(ctx, tx, req.NewOrder.Names, orderID, req.NewOrder.RegistrationID, req.NewOrder.Expires.AsTime())
 		if err != nil {
 			return nil, err