[COMPLIANCE] Add Copyright and License Headers (#1617)

* [COMPLIANCE] Add Copyright and License Headers

* chore: 🤖 update Copyright headers to satisfy our lint rules

---------

Co-authored-by: hashicorp-copywrite[bot] <110428419+hashicorp-copywrite[bot]@users.noreply.github.com>
Co-authored-by: Cameron Perera <cameron.perera@hashicorp.com>

addons/api/addon/serializers/host-catalog.js

@@ -1,3 +1,8 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
 import ApplicationSerializer from './application';
 
 const fieldsByType = {