Remove VS nupkg push (#14611)

Signing happens at the end of the build now, even with in-build signing. The staging pipeline pushes the nupkgs. This step is not necessary, and pushes unsigned nupkgs.

eng/build.yml

@@ -129,16 +129,6 @@ phases:
                   $(_InternalRuntimeDownloadArgs)
         displayName: Build
 
-    - ${{ if and(ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest'), eq(parameters.agentOs, 'Windows_NT'), ne(variables['PostBuildSign'], 'true')) }}:
-      - task: NuGetCommand@2
-        displayName: Push Visual Studio NuPkgs
-        inputs:
-          command: push
-          packagesToPush: '$(Build.SourcesDirectory)/artifacts/packages/$(_BuildConfig)/NonShipping/VS.*.nupkg'
-          nuGetFeedType: external
-          publishFeedCredentials: 'DevDiv - VS package feed'
-        condition: and(succeeded(), ne(variables['PostBuildSign'], true), eq(variables['_PushToVSFeed'], 'true'), eq(variables['_DotNetPublishToBlobFeed'], 'true'), or(eq(variables['_BuildArchitecture'], 'x64'), eq(variables['_BuildArchitecture'], 'x86')))
-
     - task: PublishTestResults@2
       displayName: Publish Test Results
       inputs: