Tag non-shipping nupkg as 'NonShipping=true' in the manifest. (#8647)

* Tag non-shipping nupkg as 'NonShipping=true' in the manifest.

* Simplifying the NuPkg publish.

* Fixing a typo...

* Changes per code review...

Author: johnbeisner

build/publish/PublishNupkgToBlobFeed.targets

@@ -1,14 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
   <ItemGroup>
     <NupkgsForPublishing Include="$(PackagesDirectory)/Microsoft.DotNet.Cli.Utils.*.nupkg" />
-    <NupkgsForPublishing Include="$(PackagesDirectory)/Microsoft.DotNet.MSBuildSdkResolver.*.nupkg" />
+    <NupkgsForPublishing Include="$(PackagesDirectory)/Microsoft.DotNet.MSBuildSdkResolver.*.nupkg">
+      <ManifestArtifactData>NonShipping=true</ManifestArtifactData>
+    </NupkgsForPublishing>
   </ItemGroup>
 
   <Target Name="PublishNupkgToBlobFeed" Condition=" '$(OS)' == 'Windows_NT' And '$(Architecture)' == 'x64' " >
     <Error Condition="'$(BlobFeedCloudDropAccessToken)' == ''" Text="Missing property BlobFeedCloudDropAccessToken." />
     <Error Condition="'$(BlobFeedExpectedURL)' == ''" Text="Missing property BlobFeedExpectedURL." />
-    
+
     <Message Text="Publish NuPkgs to Blob feed started: $(BlobFeedExpectedURL)" />
     <PushToBlobFeed ExpectedFeedUrl="$(BlobFeedExpectedURL)"
                     AccountKey="$(BlobFeedCloudDropAccessToken)"