Revert to 1.0.0.0 assembly versions

Bumping this 9.0.0.0 caused issues with XAMLC which we did add fixes to work around, but historically, moving this version has been problematic, so let's keep it at 1.0.0.0.  The workloads and nupkg's typically manage mismatched versions for us already.

eng/Versions.props

@@ -20,7 +20,7 @@
     <WorkloadsTestPreviousVersions Condition="'$(WorkloadsTestPreviousVersions)' == ''">true</WorkloadsTestPreviousVersions>
     <!-- Set assembly version to align with major and minor version,
          as for the patches and revisions should be manually updated per assembly if it is serviced. -->
-    <AssemblyVersion>$(MajorVersion).$(MinorVersion).0.0</AssemblyVersion>
+    <AssemblyVersion>1.0.0.0</AssemblyVersion>
     <!-- Opt-out repo features -->
     <UsingToolIbcOptimization>false</UsingToolIbcOptimization>
     <UsingToolXliff>false</UsingToolXliff>