Update copyright headers in testing/, tools/

The methodology used to generate this CL is documented in
https://crbug.com/1098010#c95.

No-Try: true
No-Presubmit: true
Bug: 1098010
Change-Id: I3a8a7b150e7bd64690534727150646081df50439
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3900697
Reviewed-by: Mark Mentovai <mark@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Owners-Override: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1047644}
NOKEYCHECK=True
GitOrigin-RevId: dfd88085261b662a5c0a1abea1a3b120b08e8e48

Author: Avi Drissman

build_crubit.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright 2022 The Chromium Authors. All rights reserved.
+# Copyright 2022 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 '''Builds the Crubit tool.

build_rust.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright 2022 The Chromium Authors. All rights reserved.
+# Copyright 2022 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 '''Assembles a Rust toolchain in-tree linked against in-tree LLVM.

config.toml.template

@@ -1,4 +1,4 @@
-# Copyright 2022 The Chromium Authors. All rights reserved.
+# Copyright 2022 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 

package_rust.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright 2022 The Chromium Authors. All rights reserved.
+# Copyright 2022 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 

update_rust.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-# Copyright 2022 The Chromium Authors. All rights reserved.
+# Copyright 2022 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 '''Update in-tree checkout of Rust toolchain