Suite: Fix build warnings in generated code #13431
Resolves #13386
The generated code by Suite is resulting build warnings, mostly related with nullable strings and initial values. They are harmless but it is better to remove them. This PR fixes this.
@gizemmutukurt Create projects with MVC and Blazor UI types, generate code and then run dotnet build for the projects. There must be no warnings that is related with the generated code. (there may be other warnings that is not caused by the generated code). Then you can run the projects and see if they are working.