Add no-response workflow

[mosuem]

Copy no-response (stale) workflow from i18n repo to close inactive issues.

[github-actions]

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// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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pkgs/collection/benchmark/legacy_quicksort.dart

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