Fix variable dropdown (#8521)

- fixed dropdown width
- add icons
- handle composite fields
## After

![image](https://github.com/user-attachments/assets/b9ac585e-2a39-4ab2-8620-739f83272b9b)

![image](https://github.com/user-attachments/assets/d9f7eabb-5693-4c1c-b81c-45a901479042)

![image](https://github.com/user-attachments/assets/9edced28-8a04-4951-913d-3e5561d4fcbe)

packages/twenty-server/src/modules/code-introspection/types/input-schema.type.ts

@@ -1,10 +1,13 @@
-type InputSchemaPropertyType =
+import { FieldMetadataType } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+
+export type InputSchemaPropertyType =
   | 'string'
   | 'number'
   | 'boolean'
   | 'object'
   | 'array'
-  | 'unknown';
+  | 'unknown'
+  | FieldMetadataType;
 
 export type InputSchemaProperty = {
   type: InputSchemaPropertyType;