BinaryLoggerTests.BinaryLoggerShouldEmbedSymlinkFilesViaTaskOutput failure

So far I've seen this only once in #8632 on 4deecfc2 on Windows: https://dev.azure.com/dnceng-public/public/_build/results?buildId=227836&view=ms.vss-test-web.build-test-results-tab&runId=4295098&resultId=101767&paneView=debug

```
Shouldly.ShouldAssertException : zipArchive.Entries\n should contain an element satisfying the condition\nzE.Name.EndsWith("testtaskoutputfile.txt")\n but does not

at Shouldly.ShouldBeEnumerableTestExtensions.ShouldContain[T](IEnumerable`1 actual, Expression`1 elementPredicate, Func`1 customMessage)
at Shouldly.ShouldBeEnumerableTestExtensions.ShouldContain[T](IEnumerable`1 actual, Expression`1 elementPredicate)
at Microsoft.Build.UnitTests.BinaryLoggerTests.BinaryLoggerShouldEmbedSymlinkFilesViaTaskOutput() in D:\a\1\s\src\Build.UnitTests\BinaryLogger_Tests.cs:line 324
```