REF Sample: customers want their log filters back

C# customers are used to having log filters in host.json applied to their code, but when running OOP the worker doesn't have the same filters: https://github.com/MicrosoftDocs/azure-docs/issues/72168

We need to have a reference sample that we can leverage in docs that shows how to load host.json using AddJsonFile() as suggested by @brettsam:

> since host.json is just a json file, you can use .AddJsonFile() in your ConfigureAppConfiguration setup and use that to setup logging directly in the Worker. I think you need to explicitly tell .NET where in the file the logging config is, ours is under the "logging" property.

We need to explicitly show this guidance to customers.