fix(csharp): Fixed JsonConverter for discriminators only appearing on base classes#19972

wing328 merged 2 commits intoOpenAPITools:masterOpenAPITools/openapi-generator:masterfrom

DaveK-Rocketmakers:fix/csharp-one-of-json-subtypesDaveK-Rocketmakers/openapi-generator:fix/csharp-one-of-json-subtypesCopy head branch name to clipboard