I had flakes on TraceAsyncIntegrationTests and it was hard to tell why
as there were so many problems with it. It used a normal list in async
setting, it unnecessarily created extra spans, it added a hook inside
the async method which if passed only told you it was in the middle of
an op, not the end of it. The method danced around making failure in
console almost impossible to decipher.
This took me a few hours to make just a normal test. Hopefully, the
others will keep passing as I can't afford time to redo all of them.
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