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/engine/utils/generate-fake-value.ts

@@ -7,13 +7,16 @@ type FakeValueTypes =
   | Date
   | FakeValueTypes[]
   | FieldMetadataType
-  | { [key: string]: FakeValueTypes };
+  | { [key: string]: FakeValueTypes }
+  | null;
 
-export const generateFakeValue = (valueType: string): FakeValueTypes => {
+type TypeClassification = 'Primitive' | 'FieldMetadataType';
+
+const generatePrimitiveValue = (valueType: string): FakeValueTypes => {
   if (valueType === 'string') {
-    return 'generated-string-value';
+    return 'My text';
   } else if (valueType === 'number') {
-    return 1;
+    return 20;
   } else if (valueType === 'boolean') {
     return true;
   } else if (valueType === 'Date') {
@@ -38,9 +41,51 @@ export const generateFakeValue = (valueType: string): FakeValueTypes => {
     });
 
     return objData;
-  } else if (valueType === FieldMetadataType.TEXT) {
-    return 'My text';
   } else {
-    return 'generated-string-value';
+    return null;
+  }
+};
+
+const generateFieldMetadataTypeValue = (
+  valueType: string,
+): FakeValueTypes | null => {
+  // composite types do not need to be generated
+  switch (valueType) {
+    case FieldMetadataType.TEXT:
+      return 'My text';
+    case FieldMetadataType.NUMBER:
+      return 20;
+    case FieldMetadataType.BOOLEAN:
+      return true;
+    case FieldMetadataType.DATE:
+      return '01/23/2025';
+    case FieldMetadataType.DATE_TIME:
+      return '01/23/2025 15:16';
+    case FieldMetadataType.ADDRESS:
+      return '123 Main St, Anytown, CA 12345';
+    case FieldMetadataType.FULL_NAME:
+      return 'Tim Cook';
+    case FieldMetadataType.RAW_JSON:
+      return null;
+    case FieldMetadataType.RICH_TEXT:
+      return 'My rich text';
+    case FieldMetadataType.UUID:
+      return '123e4567-e89b-12d3-a456-426614174000';
+    default:
+      return null;
+  }
+};
+
+export const generateFakeValue = (
+  valueType: string,
+  classification: TypeClassification = 'Primitive',
+): FakeValueTypes => {
+  switch (classification) {
+    case 'Primitive':
+      return generatePrimitiveValue(valueType);
+    case 'FieldMetadataType':
+      return generateFieldMetadataTypeValue(valueType);
+    default:
+      return null;
   }
 };