Comment out 'os' parameter in ci-pr.yaml

Comment out the 'os' parameter in the CI configuration.

Author: DkSkydancer

.azdo/ci-pr.yaml

@@ -18,7 +18,7 @@ extends:
     pool:
       name: Azure-Pipelines-1ESPT-ExDShared
       image: ubuntu-latest
-      os: linux
+      # os: linux
 
     stages:
     - stage: stage