Null equivalence - Empty string default value cleaning (#16217)

- on name standard field on custom object (field metadata + db)
- on text standard fields on standard object (db only)

packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/build-default-flat-field-metadatas-for-custom-object.util.ts

@@ -78,12 +78,12 @@ export const buildDefaultFlatFieldMetadatasForCustomObject = ({
     label: 'Name',
     icon: 'IconAbc',
     description: 'Name',
-    isNullable: false,
+    isNullable: true,
     isActive: true,
     isCustom: false,
     isSystem: false,
     isUIReadOnly: false,
-    defaultValue: "''",
+    defaultValue: null,
     viewFilterIds: [],
 
     createdAt,