firehose: echo any error output from dependencies task on failure

[kevmoo]

Also fix health workflow to NOT install flutter unless it's needed

Fixes #392

[kevmoo]

needed for CI to be green

[github-actions]

PR Health

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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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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
firehose	None	0.13.0	0.13.2-wip	0.13.2-wip	✔️

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Package	Status
firehose	✔️ All dependencies utilized correctly.

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File	Coverage
pkgs/firehose/lib/src/health/health.dart	💚 93 % ⬆️ 0 %

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