chore: fix flaky download test

[teemingc]

Let's see if waiting for the download event makes it less flaky.

EDIT: seems less flaky? will try re-running the CI a couple of times. Seems to only error on other flaky tests.

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[benmccann]

do we need to override the default timeout here?

[teemingc]

I can't remember if I added that because it was too short or too long. Let me try removing it.