Convert more flow tests to replay/compare (#1009)

* Convert more flow tests to replay/compare

Add the replay extension to another batch of flow tests.  In the course of
this:

- Refactor out domain deletion code into DatabaseHelper so that it can be used
  from multiple tests.
- Make null handling uniform for contact phone numbers.

* Convert postLoad method to onLoad.

* Remove "Test" import missed during rebase

* Deal with persistence of billing cancellations

Deal with the persistence of billing cancellations, which were added in the
master branch since before this PR was initially sent for review.

* Adding forgotten flyway file

* Removed debug variable

db/src/main/resources/sql/schema/nomulus.golden.sql

@@ -386,7 +386,8 @@ CREATE TABLE public."Domain" (
     transfer_billing_event_history_id bigint,
     transfer_history_entry_id bigint,
     transfer_repo_id text,
-    transfer_poll_message_id_3 bigint
+    transfer_poll_message_id_3 bigint,
+    transfer_billing_cancellation_history_id bigint
 );
 
 
@@ -477,7 +478,8 @@ CREATE TABLE public."DomainHistory" (
     transfer_billing_event_history_id bigint,
     transfer_history_entry_id bigint,
     transfer_repo_id text,
-    transfer_poll_message_id_3 bigint
+    transfer_poll_message_id_3 bigint,
+    transfer_billing_cancellation_history_id bigint
 );