update C# samples

Author: wing328

samples/client/petstore/csharp/generichost/net10/FormModels/.openapi-generator/FILES

@@ -141,7 +141,6 @@ docs/models/ZeroBasedEnumClassZeroBasedEnum.md
 docs/scripts/git_push.ps1
 docs/scripts/git_push.sh
 src/Org.OpenAPITools.Test/Api/DependencyInjectionTests.cs
-src/Org.OpenAPITools.Test/Api/FakeApiTests.cs
 src/Org.OpenAPITools.Test/Org.OpenAPITools.Test.csproj
 src/Org.OpenAPITools.Test/README.md
 src/Org.OpenAPITools/Api/AnotherFakeApi.cs