[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>

.github/ISSUE_TEMPLATE/config.yml

@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 contact_links:
   - name: Ask a question
     url: https://discuss.hashicorp.com/c/boundary

.github/labeler.yml

@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 addons:
   - addons/**/*