Running build with SkipDetectBinaries enabled causes file copy failure at end of build

Run a build with `/p:SkipDetectBinaries=true`:

```
/repos/dotnet/eng/PublishSourceBuild.props(128,5): error MSB3030: Could not copy the file "/repos/dotnet/artifacts/log/Release/binary-report/NewBinaries.txt" because it was not found. [/repos/dotnet/.packages/BootstrapPackages/microsoft.dotnet.arcade.sdk/10.0.0-beta.25302.104/tools/Publish.proj]
```