Add check for API leaks to the Health workflow

[mosuem]

Check for symbols which are not exported, but visible in the public API.

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• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

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• Larger or significant changes should be discussed in an issue before creating a PR.
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• Changes to packages require corresponding tests.

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[github-actions]

PR Health

Breaking changes ✔️

Details

Package	Change	Current Version	New Version	Needed Version	Looking good?
firehose	Non-Breaking	0.8.0	0.9.0	0.8.1	✔️

Changelog Entry ✔️

Details

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

Coverage ✔️

Details

File	Coverage
pkgs/firehose/lib/firehose.dart	💚 35 %
pkgs/firehose/lib/src/health/health.dart	💚 94 %

This check for test coverage is informational (issues shown here will not fail the PR).

API leaks ✔️

Details

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols

License Headers ✔️

Details

// Copyright (c) 2024, 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.

Files
no missing headers

All source files should start with a license header.

Package publish validation ✔️

Details

Package	Version	Status
package:firehose	0.9.0	ready to publish
package:dart_flutter_team_lints	2.1.2-wip	WIP (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:firehose	0.9.0	ready to publish	firehose-v0.9.0
package:dart_flutter_team_lints	2.1.2-wip	WIP (no publish necessary)

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.