[COMPLIANCE] Add Copyright and License Headers (#2674)

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

Author: hashicorp-copywrite[bot]

packages/components/src/modifiers/hds-code-editor/languages/sentinel.ts

@@ -1,3 +1,8 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
 import type { StringStream } from '@codemirror/language';
 
 type Quote = '"' | "'";