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Related: flutter#154251

Successful runs are bumping right up against the timeout

See https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20customer_testing/84496/overview which succeeded in 29 minutes vs. https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20customer_testing/84497/overview which failed with a timeout at 30 minutes.

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Reverts increased timeouts on customer testing from #154339, also removes bringup state from #154293.
This was related to #154251, which will be fixed by flutter/tests#406 (so we should land that first).

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