Remove unnecessary checkout: none that causes conflicts with sparse checkout declarations (Azure#3915)

Co-authored-by: Ben Broderick Phillips <bebroder@microsoft.com>

Author: azure-sdk

eng/common/pipelines/templates/steps/update-docsms-metadata.yml

@@ -34,7 +34,6 @@ parameters:
     default: ''
 steps:
   - ${{ if eq(length(parameters.PackageInfoLocations), 0) }}:
-    - checkout: none
     - pwsh: |
         Write-Host "Skipping DocsMS Update because package list was empty."
       displayName: Skip DocsMS Update