Reference Pipeline.Workspace in verify-changelog step of publish-nuget (#12411)

Author: scbedd

eng/pipelines/templates/jobs/nuget-publish.yml

@@ -62,7 +62,7 @@ jobs:
 
       - ${{ if eq(parameters.VerifyChangelog, true) }}:
         - pwsh: |
-            $(Build.SourcesDirectory)/eng/scripts/Verify-Nuget-Artifact-Changelogs.ps1 -ArtifactsPath "$(Artifacts)" -ForRelease $true
+            $(Pipeline.Workspace)/azure-sdk-tools/eng/scripts/Verify-Nuget-Artifact-Changelogs.ps1 -ArtifactsPath "$(Artifacts)" -ForRelease $true
           displayName: Verify Changelogs for artifacts
 
       - ${{ if eq(parameters.ShouldSign, true) }}: