Use the replica jpaTm in FKI and EppResource cache methods (#1503)

The cached methods are only used in situations where we don't really
care about being 100% synchronously up to date (e.g. whois), and they're
not used frequently anyway, so it's safe to use the replica in these
locations.

core/src/test/java/google/registry/persistence/transaction/JpaTransactionManagerExtension.java

@@ -217,11 +217,14 @@ abstract class JpaTransactionManagerExtension implements BeforeEachCallback, Aft
     JpaTransactionManagerImpl txnManager = new JpaTransactionManagerImpl(emf, clock);
     cachedTm = TransactionManagerFactory.jpaTm();
     TransactionManagerFactory.setJpaTm(Suppliers.ofInstance(txnManager));
+    TransactionManagerFactory.setReplicaJpaTm(
+        Suppliers.ofInstance(new ReplicaSimulatingJpaTransactionManager(txnManager)));
   }
 
   @Override
   public void afterEach(ExtensionContext context) {
     TransactionManagerFactory.setJpaTm(Suppliers.ofInstance(cachedTm));
+    TransactionManagerFactory.setReplicaJpaTm(Suppliers.ofInstance(cachedTm));
     // Even though we didn't set this, reset it to make sure no other tests are affected
     JpaTransactionManagerImpl.removeReplaySqlToDsOverrideForTest();
     cachedTm = null;

core/src/test/java/google/registry/persistence/transaction/ReplicaSimulatingJpaTransactionManager.java

@@ -91,9 +91,15 @@ public class ReplicaSimulatingJpaTransactionManager implements JpaTransactionMan
 
   @Override
   public <T> T transact(Supplier<T> work) {
+    if (delegate.inTransaction()) {
+      return work.get();
+    }
     return delegate.transact(
         () -> {
-          delegate.getEntityManager().createQuery("SET TRANSACTION READ ONLY").executeUpdate();
+          delegate
+              .getEntityManager()
+              .createNativeQuery("SET TRANSACTION READ ONLY")
+              .executeUpdate();
           return work.get();
         });
   }