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We've recently rebalanced our lab devices to get a fewer number of grunts. Switch to scheduling only on the newer shinier ones, running fewer tests. We'll evaluate the runtime, and if they're quick enough then we can increase the amount of testing we do. Signed-off-by: Daniel Stone <daniels@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20081>