IResult implementation types are now publicly available

[Rick-Anderson]

In MinApiTestsSample, create at least one sample that uses the IResult implementation types are now publicly available from Improved unit testability for minimal route handlers

@brunolins16 dotnet/aspnetcore#40965 mentions all these <HTTP Status>HttpResult mentioned in the blog, but they're no longer in the source and I can't find a PR where they were renamed. The history of Results.cs doesn't make the renaming obvious. Please advise.

[brunolins16]

@Rick-Anderson All HttpResults are now in the **.HttpResults namespace in this folder HttpResults src and they were moved to the new namespace, also some of them were renamed in this PR dotnet/aspnetcore#41161.

I saw that the unit tests, in the sample, are already using the HttpResults types but in combination with Results static class, maybe we could add tests that use the Interfaces when returning a IResult and add endpoints with TypedResults static class that return the concrete type, or maybe Result<T1, TN> and unit test for them.

[brunolins16]

Also, I have been working on dotnet/aspnetcore#44258 that might cover some of this content.

[sammychinedu2ky]

@Rick-Anderson please where should the sample code go to?

[Rick-Anderson]

In MinApiTestsSample, create at least one sample that uses the IResult implementation types are now publicly available from Improved unit testability for minimal route handlers

I think in n MinApiTestsSample

[Rick-Anderson]

Fixed in #115