Crush out shared code in contact flows, especially transfer

Although the delta implies that this is actually adding code, it's
better than it looks, because some of the stuff in ContactFlowUtils
is duplicating more generic methods in ResourceFlowUtils, which
can be deleted when the domain and host flows are cut over.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=133149104

java/google/registry/model/EppResource.java

@@ -32,6 +32,7 @@ import google.registry.model.eppcommon.StatusValue;
 import google.registry.model.eppoutput.EppResponse.ResponseData;
 import google.registry.model.ofy.CommitLogManifest;
 import google.registry.model.transfer.TransferData;
+import google.registry.model.transfer.TransferStatus;
 import java.util.Set;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlTransient;
@@ -303,6 +304,27 @@ public abstract class EppResource extends BackupGroupRoot implements Buildable,
       return thisCastToDerived();
     }
 
+    /**
+     * Remove a pending transfer.
+     *
+     * <p>This removes the {@link StatusValue#PENDING_TRANSFER} status, clears all the
+     * server-approve fields on the {@link TransferData} including the extended registration years
+     * field, and sets the expiration time of the last pending transfer (i.e. the one being cleared)
+     * to now.
+     */
+    public B clearPendingTransfer(TransferStatus transferStatus, DateTime now) {
+      removeStatusValue(StatusValue.PENDING_TRANSFER);
+      return setTransferData(getInstance().getTransferData().asBuilder()
+          .setExtendedRegistrationYears(null)
+          .setServerApproveEntities(null)
+          .setServerApproveBillingEvent(null)
+          .setServerApproveAutorenewEvent(null)
+          .setServerApproveAutorenewPollMessage(null)
+          .setTransferStatus(transferStatus)
+          .setPendingTransferExpirationTime(now)
+          .build());
+    }
+
     /** Wipe out any personal information in the resource. */
     public B wipeOut() {
       return thisCastToDerived();

java/google/registry/model/transfer/TransferStatus.java

@@ -50,4 +50,8 @@ public enum TransferStatus {
   public String getXmlName() {
     return CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.LOWER_CAMEL, toString());
   }
+
+  public boolean isApproved() {
+    return this.equals(CLIENT_APPROVED) || this.equals(SERVER_APPROVED);
+  }
 }