Add empty json to changelog, don't push git in dry run

.ado/azure-pipelines.yml

@@ -170,7 +170,7 @@ jobs:
         displayName: 'yarn test'
 
       - script: |
-          yarn publish:beachball -- -b origin/master -n $(npmAuth) --access public -y --no-publish
+          yarn publish:beachball -- -b origin/master -n $(npmAuth) --access public -y --no-publish --no-push
         displayName: 'Publish NPM Packages'
 
   - job: NuGetPublishDryRun

packages/experimental/Shimmer/CHANGELOG.json

@@ -1 +1,4 @@
-
+{
+  "name": "@fluentui-react-native/experimental-shimmer",
+  "entries": []
+}