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Symreader failing with duplicate FileSignInfos

See original GitHub issue

This issue is blocking symreader official builds
This issue is causing unreasonable pain

https://dev.azure.com/dnceng/internal/_build/results?buildId=1026735&view=artifacts&pathAsName=false&type=publishedArtifacts

D:\workspace\_work\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21105.12\tools\Publish.proj(151,5): The following files have conflicting FileSignInfo entries: Microsoft.DiaSymReader.dll
   at Microsoft.DotNet.VersionTools.BuildManifest.Model.SigningInformationParsingExtensions.ThrowIfInvalidFileSignInfo(IEnumerable`1 fileSignInfo) in /_/src/Microsoft.DotNet.VersionTools/lib/src/BuildManifest/Model/SigningInformationParsingExtensions.cs:line 116
   at Microsoft.DotNet.VersionTools.BuildManifest.Model.SigningInformationModel.ToXml() in /_/src/Microsoft.DotNet.VersionTools/lib/src/BuildManifest/Model/SigningInformationModel.cs:line 35
   at Microsoft.DotNet.VersionTools.BuildManifest.Model.BuildModel.ToXml() in /_/src/Microsoft.DotNet.VersionTools/lib/src/BuildManifest/Model/BuildModel.cs:line 28
   at Microsoft.DotNet.Build.Tasks.Feed.BuildModelFactory.CreateBuildManifest(IEnumerable`1 blobArtifacts, IEnumerable`1 packageArtifacts, String assetManifestPath, String manifestRepoName, String manifestBuildId, String manifestBranch, String manifestCommit, String[] manifestBuildData, Boolean isStableBuild, PublishingInfraVersion publishingVersion, Boolean isReleaseOnlyPackageVersion, SigningInformationModel signingInformationModel) in /_/src/Microsoft.DotNet.Build.Tasks.Feed/src/BuildModelFactory.cs:line 118
   at Microsoft.DotNet.Build.Tasks.Feed.PushToAzureDevOpsArtifacts.ExecuteTask(IFileSystem fileSystem, ISigningInformationModelFactory signingInformationModelFactory, IBlobArtifactModelFactory blobArtifactModelFactory, IPackageArtifactModelFactory packageArtifactModelFactory, IBuildModelFactory buildModelFactory) [D:\workspace\_work\1\s\.packages\microsoft.dotnet.arcade.sdk\6.0.0-beta.21105.12\tools\Publish.proj]

This appears to be a bug, as the file sign info in the repo seems valid: https://github.com/dotnet/symreader/blob/master/eng/Signing.props#L4-L5

There is also a test for this case already in arcade: https://github.com/dotnet/arcade/blob/master/src/Microsoft.DotNet.VersionTools/tests/BuildManifest/ManifestModelTests.cs#L140

So, this is a bit of a mystery at the moment.