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Helix SDK failing to post test results to azure devops

See original GitHub issue

Seeing various reports of failures when POSTing test runs to the URL: https://dev.azure.com/dnceng/public/_apis/test/runs?api-version=5.0-preview.2

which is manifesting in 503 errors:

F:\workspace\_work\1\s\.packages\microsoft.dotnet.helix.sdk\2.0.0-beta.19463.3\tools\azure-pipelines\AzurePipelines.MultiQueue.targets(16,5): error : Request to https://dev.azure.com/dnceng/public/_apis/test/runs?api-version=5.0-preview.2 returned failed status 503 Service Unavailable [F:\workspace\_work\1\s\tests\helixpublishwitharcade.proj]
F:\workspace\_work\1\s\.packages\microsoft.dotnet.helix.sdk\2.0.0-beta.19463.3\tools\azure-pipelines\AzurePipelines.MultiQueue.targets(16,5): error :  [F:\workspace\_work\1\s\tests\helixpublishwitharcade.proj]
F:\workspace\_work\1\s\.packages\microsoft.dotnet.helix.sdk\2.0.0-beta.19463.3\tools\azure-pipelines\AzurePipelines.MultiQueue.targets(16,5): error : {"$id":"1","innerException":null,"message":"TF10216: Azure DevOps services are currently unavailable. Try again later. Activity Id: 492fec1d-55ee-47f2-8853-0f26bdefb63d","typeName":"Microsoft.VisualStudio.Services.CircuitBreaker.CircuitBreakerShortCircuitException, Microsoft.VisualStudio.Services.Common","typeKey":"CircuitBreakerShortCircuitException","errorCode":0,"eventId":3000} [F:\workspace\_work\1\s\tests\helixpublishwitharcade.proj]
##[error].packages\microsoft.dotnet.helix.sdk\2.0.0-beta.19463.3\tools\azure-pipelines\AzurePipelines.MultiQueue.targets(16,5): error : (NETCORE_ENGINEERING_TELEMETRY=Test) Request to https://dev.azure.com/dnceng/public/_apis/test/runs?api-version=5.0-preview.2 returned failed status 503 Service Unavailable

Code is here:https://github.com/dotnet/arcade/blob/64a027b8d8b3a8e8e214bb00da02148335e3bd92/src/Microsoft.DotNet.Helix/Sdk/StartAzurePipelinesTestRun.cs#L26