[COMPLIANCE] Update Copyright Headers (#6282)

* [COMPLIANCE] Update Copyright and License Headers

* chore: make gen to generate files with copyright headers

* chore: update missed copyright headers

---------

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

api/proxy/credentials.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/credentials_test.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/option.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/option_test.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/proxy.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/proxy_test.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/testing.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/tls.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy

api/proxy/websocket.go

@@ -1,4 +1,4 @@
-// Copyright (c) HashiCorp, Inc.
+// Copyright IBM Corp. 2020, 2025
 // SPDX-License-Identifier: MPL-2.0
 
 package proxy