Add ecosystem groundskeeper workflow

[mosuem]

Adds the ecosystem groundskeeper workflow to run dart format and dart fix across packages in the repository.

[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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Files
pkgs/cupertino_http/example/example.dart
pkgs/http/example/main.dart
pkgs/http_multi_server/test/cert.dart

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[brianquinlan]

Does this work with flutter packages? Also do you need "dart format" to be using the "stable" SDK version in all workflows for this to make sense? I think that package:http2 is using "dev".