Remove warning for unused camel case vendor extension for Qt5 client and server (OpenAPITools#5731)

Author: etherealjoy

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CppQt5AbstractCodegen.java

@@ -316,9 +316,6 @@ public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> o
         List<Map<String, String>> imports = (List<Map<String, String>>) objs.get("imports");
         Map<String, CodegenModel> codegenModels = new HashMap<String, CodegenModel>();
 
-        // TODO: 5.0: Remove the camelCased vendorExtension below and ensure templates use the newer property naming.
-        once(LOGGER).warn("4.3.0 has deprecated the use of vendor extensions which don't follow lower-kebab casing standards with x- prefix.");
-
         for (Object moObj : allModels) {
             CodegenModel mo = ((Map<String, CodegenModel>) moObj).get("model");
             if (mo.isEnum) {
@@ -328,7 +325,6 @@ public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> o
         for (CodegenOperation operation : operations) {
             if (operation.returnType != null) {
                 if (codegenModels.containsKey(operation.returnType)) {
-                    operation.vendorExtensions.put("returnsEnum", true); // TODO: 5.0 Remove
                     operation.vendorExtensions.put("x-returns-enum", true);
                 }
             }