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Flaky SQS FIFO many-producer stream test observes zero deliveries #11022

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@ReubenBond

The AWS SQS provider net8.0 job intermittently failed in AWSUtils.Tests.Streaming.SQSFIFOStreamTests.SQS_17_MultipleStreams_1J_ManyProducerGrainsManyConsumerGrains.

Observed in CI run 33735324951, job AWS SQS provider tests (net8.0): https://github.com/dotnet/orleans/actions/runs/33735324951/job/100584403778

The test timed out after approximately 31 seconds while waiting for 10 deliveries on one stream from SQSProvider, observing 0 deliveries:

System.OperationCanceledException: Canceled while waiting for 10 item deliveries on stream null/41c72c9b489b420c810cac4fc09ba94c from provider 'SQSProvider'; observed 0.

The failure occurred on PR #11019, which only changes synchronization in an Orleans journaling unit-test helper. The same CI job successfully built and ran Orleans.Journaling.Tests. PR #10945 (fix(testing): scope diagnostic observers to test clusters) was already merged into the tested base, so this failure remains after that change.

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