Enable changelog updates in groundskeeper workflow

[mosuem]

Ported changes from labs groundskeeper workflow to enable changelog updates with a default message.

[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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[natebosch]

I tend to omit stuff from the changelog when it's not user facing. I think we expect automated changes like that to have no impact on end users, and it's better to optimize for that case than to add changelog entries in case an automated fix happens to be unexpectedly breaking.

[mosuem]

Ok, sounds good to me.