Xcode is in some kind of half-installed state (missing a cert? unknown) on some devicelab Macs#161655. As of#163685 Xcode cipd installation isn't requested as part of the builder configuration, so it seems like Xcode is just hanging out on that devicelab bot quasi-installed, unrelated to the recipe.

In any case, the tool is actually doing the right thing and detecting that Xcode isn't in a good state and continuing as if it isn't installed, but is logging a wall of error text about it to stderr, which that Android test doesn't like. Instead of updating the test to allow stderr, instead swap the Xcode installation path toexitsHappySync to only check the exit code (or exception), which is the original intention behind the Xcode command line checks.

Fixes#161655

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