adding copyright header (#19555)

* adding copyright header

* fix fmt and a test

ui/scripts/codemods/transform-deprecated-args.js

@@ -1,4 +1,9 @@
 #!/usr/bin/env node
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
 /* eslint-env node */
 /**
  * Codemod to convert args to attributes for Input and TextArea built in components