V3 publishing (#25784)

* v3 changes

.azure/pipelines/ci.yml

@@ -750,6 +750,7 @@ stages:
 - ${{ if and(ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
   - template: /eng/common/templates/post-build/post-build.yml
     parameters:
+      publishingInfraVersion: 3
       enableSymbolValidation: false
       enableSigningValidation: false
       enableNugetValidation: false

eng/Publishing.props

@@ -1,4 +1,8 @@
 <Project>
+  <PropertyGroup>
+    <PublishingVersion>3</PublishingVersion>
+  </PropertyGroup>
+
   <PropertyGroup>
     <!-- The one use of ArtifactsDir in Publish.proj adds an additional slash, confusing itself. -->
     <ArtifactsDir Condition=" HasTrailingSlash('$(ArtifactsDir)') ">$(ArtifactsDir.Substring(0, $([MSBuild]::Subtract($(ArtifactsDir.Length), 1))))</ArtifactsDir>