Add a field to save the login email of a RegistrarPoc (#1849)

This will replace the gaeUserId field. For now the field is not used and
only added to alter the schema.

db/src/main/resources/sql/flyway/V130__add_login_email_column_to_registrarpoc.sql

@@ -0,0 +1,17 @@
+-- Copyright 2022 The Nomulus Authors. All Rights Reserved.
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--     http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+alter table "RegistrarPoc" add column login_email_address text;
+create index registrarpoc_login_email_idx on "RegistrarPoc" (login_email_address);
+