c02b805cdc
In another change (#37646), I want to test that a test fails and prints expected output. I didn't see an existing way to do that, so I modified `_runFlutterTest` and `runCommand` to allow capturing the output. Currently capturing and printing output are mutually exclusive since we don't need both. Some awkward bits: * There already exists a `runAndGetStdout` function that is very similar to `runCommand`, and this change makes the conceptual distinction more confusing. * `runFlutterTest` has multiple code paths for different configurations. I don't understand what the different paths are for, and I added output checking only along one of them.
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