Allow for no fee extension with free premium domains (#2660)

This isn't a situation we'll encounter often, but if the client has an
allocation token that's valid for premium domains that gives a 0 cost,
we shouldn't require them to include the fee extension when creating the
domain. We already don't require it for standard domains.

core/src/main/java/google/registry/flows/domain/FeesAndCredits.java

@@ -64,7 +64,7 @@ public class FeesAndCredits extends ImmutableObject implements Buildable {
   }
 
   public boolean hasAnyPremiumFees() {
-    return fees.stream().anyMatch(BaseFee::isPremium);
+    return fees.stream().anyMatch(fee -> fee.isPremium() && !fee.hasZeroCost());
   }
 
   /** Returns the create cost for the event. */