Add 2.1 & 3.1 templates to TextOnlyPrebuilts

Author: dseefeld

eng/SourceBuild.Tarball.TextOnlyPrebuilts.targets

@@ -22,6 +22,13 @@
     -->
     <ItemGroup>
       <TextOnlyPrebuiltNupkgFile Include="
+        $(ProjectDir)packages\restored\**\microsoft.dotnet.web.itemtemplates.2.1.*.nupkg;
+        $(ProjectDir)packages\restored\**\microsoft.dotnet.web.projecttemplates.2.1.2.1.*.nupkg;
+        $(ProjectDir)packages\restored\**\microsoft.dotnet.web.spa.projecttemplates.2.1.2.1.*.nupkg;
+        $(ProjectDir)packages\restored\**\microsoft.dotnet.common.itemtemplates.3.1.*.nupkg;
+        $(ProjectDir)packages\restored\**\microsoft.dotnet.web.itemtemplates.3.1.*.nupkg;
+        $(ProjectDir)packages\restored\**\microsoft.dotnet.web.projecttemplates.3.1.3.1.*.nupkg;
+        $(ProjectDir)packages\restored\**\microsoft.dotnet.web.spa.projecttemplates.3.1.3.1.*.nupkg;
         $(ProjectDir)packages\restored\**\microsoft.dotnet.web.itemtemplates.5.0.*.nupkg;
         $(ProjectDir)packages\restored\**\microsoft.dotnet.web.projecttemplates.5.0.5.0.*.nupkg;
         $(ProjectDir)packages\restored\**\microsoft.dotnet.web.spa.projecttemplates.5.0.5.0.*.nupkg;