Add new line to the end of json files

Author: Dima-X

dotnet/scalardb-cluster-sample/global.json

@@ -4,4 +4,4 @@
     "rollForward": "latestMinor",
     "allowPrerelease": false
   }
-}
+}

dotnet/scalardb-cluster-sample/scalardb-options.json

@@ -2,4 +2,4 @@
     "ScalarDbOptions": {
         "Address": "http://localhost:60053"
     }
-}
+}