Relax assumptions on workspaces in firehose

[mosuem]

This led to packages not being found in the grpc-dart repo. I think this should be fine, any packages which should not be checked can still be ignored in the publish.yaml.

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[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
firehose	None	0.11.0	0.12.1-wip	0.11.0	✔️

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Package	Changed Files

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Coverage ✔️

File	Coverage
pkgs/firehose/lib/src/repo.dart	💚 91 % ⬆️ 0 %

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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.

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[dcharkes]

I believe this might have broken some checks:

• https://github.com/dart-lang/native/actions/runs/18411081612/job/52463719387?pr=2687

[mosuem]

Uncovered broken setups you mean 😉