[COMPLIANCE] Add Copyright and License Headers

plugin/testdata/basic/iam.tf

@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 variable "iam_user_prefix" {
   default = "boundary-plugin-host-aws-test-iam-user"
 }

plugin/testdata/basic/main.tf

@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 terraform {
   required_providers {
     aws = {

plugin/testdata/basic/vpc_ec2.tf

@@ -1,3 +1,6 @@
+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
 variable "instance_tags" {
   default = [
     {