Add suggested values for variable dropdown (#9437)

<img width="378" alt="Capture d’écran 2025-01-07 à 15 37 20"
src="https://github.com/user-attachments/assets/c15abcac-684a-4c3b-ad12-62cf91afe927"
/>

Here is a first version:
- simple fields have a suggested value
- composite do not, but sub values of composite do
- json, arrays or complex values do not

packages/twenty-server/src/modules/workflow/workflow-builder/utils/generate-fake-object-record.ts

@@ -25,7 +25,7 @@ const generateObjectRecordFields = (
           type: field.type,
           icon: field.icon,
           label: field.label,
-          value: generateFakeValue(field.type),
+          value: generateFakeValue(field.type, 'FieldMetadataType'),
         };
       } else {
         acc[field.name] = {
@@ -37,7 +37,7 @@ const generateObjectRecordFields = (
               isLeaf: true,
               type: property.type,
               label: camelToTitleCase(property.name),
-              value: generateFakeValue(property.type),
+              value: generateFakeValue(property.type, 'FieldMetadataType'),
             };
 
             return acc;