Make health file name configurable

[mosuem]

We run all the checks on all files every time the health workflow file is changed - so far that name was hardcoded. This enables it for other names, such as health_internal.yaml for this repo. The checks in this PR show that it works :)

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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:dart_flutter_team_lints	3.5.2	already published at pub.dev
package:firehose	0.12.0	ready to publish	firehose-v0.12.0

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

[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
dart_flutter_team_lints	None	3.5.2	3.5.2	3.5.2	✔️
firehose	Breaking	0.11.0	0.12.0	0.12.0	✔️

Changelog Entry ✔️

Package	Changed Files

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

Coverage ⚠️

File	Coverage
pkgs/dart_flutter_team_lints/tool/dedup.dart	💔 Not covered
pkgs/firehose/lib/firehose.dart	💔 0 % ⬇️ NaN %
pkgs/firehose/lib/src/changelog.dart	💚 100 %
pkgs/firehose/lib/src/delayed_client.dart	💚 23 %
pkgs/firehose/lib/src/github.dart	💚 68 %
pkgs/firehose/lib/src/health/changelog.dart	💚 97 %
pkgs/firehose/lib/src/health/coverage.dart	💚 77 %
pkgs/firehose/lib/src/health/health.dart	💔 94 % ⬇️ 0 %
pkgs/firehose/lib/src/health/lcov.dart	💚 89 %
pkgs/firehose/lib/src/health/license.dart	💚 100 %
pkgs/firehose/lib/src/pub.dart	💚 89 %
pkgs/firehose/lib/src/repo.dart	💚 91 %
pkgs/firehose/lib/src/utils.dart	💚 20 %

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

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API leaks ✔️

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 symbol	Leaking sources

License Headers ✔️

// Copyright (c) 2025, 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

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[devoncarew]

Do we need a default here?

[devoncarew]

It looks like below we default to checking for health.yaml or health.yml. Separately, it might be nice to figure out which of those extensions is more common, and only support that (health.yaml?).