Add tests to check staleness of checked-in reference config files

There are a few reference config files checked-in in the `Service.Tests` directory. Whenever there is a change in the way CLI generates a config file, these reference config file needs to be updated to reflect the latest changes.

At the moment, there is no validation to ensure that these reference files are as per the latest format. So, these config files tends to go out of date.

Hence, add tests to ensure that these reference config files stay up to date.