Include default Backstage headers on migration files

Signed-off-by: Damon Kaswell <damon.kaswell1@hp.com>

plugins/incremental-ingestion-backend/migrations/20220613125155_init.js

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2022 The Backstage Authors
+ *
+ * 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.
+ */
+
 exports.up = async function (knex) {
   await knex.raw(`
 CREATE VIEW ingestion.current_entities as SELECT

plugins/incremental-ingestion-backend/migrations/20220906161750_add-ingestion-indexes.js

@@ -1,5 +1,21 @@
+/*
+ * Copyright 2022 The Backstage Authors
+ *
+ * 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.
+ */
+
 /**
- * @param { import("knex").Knex } knex
+ * @param { import('knex').Knex } knex
  * @returns { Promise<void> }
  */
 exports.up = async function (knex) {