[anlaysis_server] Fix flaky verify_sorted test This test appears to have been flaky for a while. Sometimes the analysis status triggers multiple times during the test run which results in "Future already completed" errors. It's not clear why the status fires multiple times (I cannot reproduce it locally despite running in a loop for a while) but the test really only cares about detecting that initial analysis has completed, so I've changed it only track the first instance. Change-Id: If8e5d5b3ba27217bbdce94a68840882773920351 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/347020 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Samuel Rawlins <srawlins@google.com>
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