Correctly wait for completion of DelegatingXmlCreationSink #906
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With dotnet/runtime#62501 we were only waiting for completion of the DelegatingExecutionSummarySink, not the DelegatingXmlCreationSink.
Since DelegatingXmlCreationSink doesn't provide a callback when testing is done we need to add a wrapper execution sink that listens for the ITestAssemblyFinished message.
I also noticed we were using MemoryStream.ToArray() when sending the results which creates an additional copy that we can avoid.
Fixes #903