Fix "Controller" suffix removal

[marius-hofmann]

• Only remove last occurrence of "Controller" when processing controller name in WebApiOpenApiDocumentGenerator
• To match implementation of aspnetcore: https://github.com/dotnet/aspnetcore/blob/main/src/Mvc/Mvc.Core/src/ApplicationModels/DefaultApplicationModelProvider.cs#L164-L167

[marius-hofmann]

@lahma thanks for having a look at my PR. I'm sorry, that the tests failed, but I think, the failing is not caused by my changes. It seems like http://petstore.swagger.io/v2/swagger.json returned a 502 during the test execution. I don't know if this is a permanent issue or just a short service outage. Could you re-run the checks in order to verify if there is a more permanent problem?

[RicoSuter]

@marius-hofmann should we do the same for the asp.net core implementation as well?

[marius-hofmann]

@marius-hofmann should we do the same for the asp.net core implementation as well?

@RicoSuter What exactly do you mean? I could not find another position which uses this logic.