Add unit tests for service resolution

[jaredcnance]

We should have a test that validates each service can actually be resolved from the container (within a scope). See #339 for motivation. It would be fantastic if this could be done via reflection and not manually adding a new test every time you register a new service. I'm thinking we would define a static member that contained all the ServiceDescriptors. Then in the test we just get this member and iterate over them to make sure they can all be resolved from the container.

[bart-degreed]

Something along the lines of https://github.com/dlemstra/ICanHazDadJoke/blob/main/test/ICanHazDadJoke.Api.Tests/AppStartup/StartupTests/TheDependencyInjectionRegistration.cs