9024 workflow test serverless function follow up (#9066)

-  Fix Tablist style
- Fix dropdown style (wrong grey background)
- Update dropdown variable when no outputSchema is available 



https://github.com/user-attachments/assets/56698fe8-8dd3-404a-b2b2-f1eca6f5fa28

packages/twenty-front/src/modules/serverless-functions/utils/getFunctionOutputSchema.ts

@@ -32,6 +32,7 @@ export const getFunctionOutputSchema = (testResult: object) => {
           if (isObject(value) && !Array.isArray(value)) {
             acc[key] = {
               isLeaf: false,
+              icon: 'IconVariable',
               value: getFunctionOutputSchema(value),
             };
           } else {
@@ -39,6 +40,7 @@ export const getFunctionOutputSchema = (testResult: object) => {
               isLeaf: true,
               value,
               type: getValueType(value),
+              icon: 'IconVariable',
             };
           }
           return acc;