Revert compiler update that slowed down the build

This restores the compiler toolset from prior to #41575 to mitigate the
build performance regression.

Author: sharwell

eng/Versions.props

@@ -33,6 +33,7 @@
     <VisualStudioEditorPackagesVersion>16.4.248</VisualStudioEditorPackagesVersion>
     <ILToolsPackageVersion>5.0.0-alpha1.19409.1</ILToolsPackageVersion>
     <MicrosoftVisualStudioLanguageServerPackagesVersion>16.3.27-develop-gdd55e997</MicrosoftVisualStudioLanguageServerPackagesVersion>
+    <MicrosoftNetCompilersToolsetVersion>3.5.0-beta2-20074-05</MicrosoftNetCompilersToolsetVersion>
   </PropertyGroup>
   <!-- 
     Dependency versions