chore: Improve Upgrade with Alternative URLs test #294
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Previously we would wait until the node becomes unavailable, as a sign that it was upgrading. This is imprecise and sometimes flaky, see here. The logs reveal that the replica did in fact upgrade successfully, but I suspect the "unhealthy" status didn't persist long enough to be picked up by the test driver.
With this PR we instead wait until the node is running the expected replica version after the upgrade.