Remove UsingToolNetFrameworkReferenceAssemblies (#16783)

UsingToolNetFrameworkReferenceAssemblies got removed from Arcade a while ago as the SDK supports that natively.

... same for the sourcelink switch

Author: ViktorHofer

eng/Versions.props

@@ -3,9 +3,7 @@
     <!-- opt-out properties -->
     <UsingToolXUnit>false</UsingToolXUnit>
     <!-- opt-in properties -->
-    <UsingToolNetFrameworkReferenceAssemblies>true</UsingToolNetFrameworkReferenceAssemblies>
     <UsingToolNuGetRepack>true</UsingToolNuGetRepack>
-    <UsingToolSourceLink>true</UsingToolSourceLink>
     <UsingToolSymbolUploader>true</UsingToolSymbolUploader>
     <UsingToolVSSDK>true</UsingToolVSSDK>
   </PropertyGroup>