Packages `Linux` targets should run on VMs only rather than devicelab bots

See `Linux analyze stable` is running on devicelab bots: https://ci.chromium.org/ui/p/flutter/builders/staging/Linux%20analyze%20stable/1/overview

We are missing bot dimensions: https://github.com/flutter/packages/blob/main/.ci.yaml#L12