vivian: add timeout for wait_for_endpoint
This shouldn't wait forever for the endpoint to come up since it can cause CI to hang until it times out (e.g. 1hr). 60s seems like a reasonable amount of time to wait.
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This shouldn't wait forever for the endpoint to come up since it can cause CI to hang until it times out (e.g. 1hr). 60s seems like a reasonable amount of time to wait.