Support date and notAfter in fee extension response v12

When custom effective date is passed in the check command, the response should
contain that date as an acknowledgemant that the check is performed at a time
different from now.

Also when the fee(s) returned contains a validDateRange (i. e. EAP fees that
are only valid during a certain period), the response will contain a notAfter
field which is the date after which the quoted fee(s) are no longer valid. (i.
e. the earliest of the end dates of all fees that would expire.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=133989775

java/google/registry/model/domain/fee06/FeeInfoResponseExtensionV06.java

@@ -20,6 +20,7 @@ import google.registry.model.eppoutput.EppResponse.ResponseExtension;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlType;
 import org.joda.money.CurrencyUnit;
+import org.joda.time.DateTime;
 
 /**
  * An XML data object that represents a fee extension that may be present on the response to EPP
@@ -52,5 +53,15 @@ public class FeeInfoResponseExtensionV06
       getInstance().currency = currency;
       return this;
     }
+
+    @Override
+    public Builder setEffectiveDateIfSupported(DateTime effectiveDate) {
+      return this;
+    }
+
+    @Override
+    public Builder setNotAfterDateIfSupported(DateTime notAfterDate) {
+      return this;
+    }
   }
 }