we are using a pool not a specific vmImage (Azure#16213)

Author: scbedd

eng/pipelines/templates/jobs/archetype-sdk-client.yml

@@ -233,7 +233,7 @@ jobs:
       - 'Build'
 
     pool:
-      vmImage: ${{ parameters.LinuxPool }}
+      name: ${{ parameters.LinuxPool }}
 
     steps:
     - template: ../steps/test_regression.yml