Demonstration of Net6 Integration tests with multiple servers (WebApplicationFactory) that communicate to each other via a fallback mechanism

This Web API has one controller with two methods:

• hello - replies with a message that contains the address where it is running from
• fallback - uses an HttpClient to do an HttpRequest to hello endpoint in the fallback server

(Credit for https://github.com/GennadyGS for providing the basis for what I was going for)