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-server/src/modules/workflow/workflow-builder/types/output-schema.type.ts

@@ -15,6 +15,13 @@ export type Node = {
   value: OutputSchema;
 };
 
+type Link = {
+  isLeaf: true;
+  tab?: string;
+  icon?: string;
+  label?: string;
+};
+
 export type BaseOutputSchema = Record<string, Leaf | Node>;
 
 export type RecordOutputSchema = {
@@ -23,4 +30,12 @@ export type RecordOutputSchema = {
   _outputSchemaType: 'RECORD';
 };
 
-export type OutputSchema = BaseOutputSchema | RecordOutputSchema;
+export type LinkOutputSchema = {
+  link: Link;
+  _outputSchemaType: 'LINK';
+};
+
+export type OutputSchema =
+  | BaseOutputSchema
+  | RecordOutputSchema
+  | LinkOutputSchema;