Scope down lastTransferTime to only ContactResource, DomainResource

and HostResource.

DomainApplication is not transferable and has no need for this
field. HostResource needs it because it can be transferred with
a domain.

This is all in service of removing the ofy().load() inside of
host's cloneProjectedAtTime.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=139346925

javatests/google/registry/testing/ContactResourceSubject.java

@@ -162,6 +162,19 @@ public final class ContactResourceSubject
         "has transfer losingClientId");
   }
 
+  public And<ContactResourceSubject> hasLastTransferTime(DateTime lastTransferTime) {
+    return hasValue(
+        lastTransferTime,
+        actual().getLastTransferTime(),
+        "has lastTransferTime");
+  }
+
+  public And<ContactResourceSubject> hasLastTransferTimeNotEqualTo(DateTime lastTransferTime) {
+    return doesNotHaveValue(
+        lastTransferTime,
+        actual().getLastTransferTime(),
+        "lastTransferTime");
+  }
   public static DelegatedVerb<ContactResourceSubject, ContactResource> assertAboutContacts() {
     return assertAbout(new SubjectFactory());
   }