orchestrator: Make global tests more robust; use generic Expect function #1676
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The global orchestrator tests were pausing 200 ms to wait for some events to pass. It's more reliable to just consume these specific events. This changes them to do that, and also replace testutils.Expect* with a single Expect function. This is nicer than having a separate function for every event type. The Checks in the event structure can be used to match specific event properties.
In the future, I may also convert testutils.Watch* to a similar Watch function.
cc @dongluochen