feat: NoValue is bot properly created the backend (#9110)

`No Value` view groups wasn't properly created when we select a group by
field metadata, this PR fix the issue.
Also a script is added to backfill the current view groups.

---------

Co-authored-by: Marie <51697796+ijreilly@users.noreply.github.com>

packages/twenty-front/src/modules/object-record/record-index/hooks/useHandleRecordGroupField.ts

@@ -73,6 +73,20 @@ export const useHandleRecordGroupField = ({
               }) satisfies ViewGroup,
           );
 
+        if (
+          !existingGroupKeys.has(`${fieldMetadataItem.id}:`) &&
+          fieldMetadataItem.isNullable === true
+        ) {
+          viewGroupsToCreate.push({
+            __typename: 'ViewGroup',
+            id: v4(),
+            fieldValue: '',
+            isVisible: true,
+            position: fieldMetadataItem.options.length,
+            fieldMetadataId: fieldMetadataItem.id,
+          } satisfies ViewGroup);
+        }
+
         const viewGroupsToDelete = view.viewGroups.filter(
           (group) => group.fieldMetadataId !== fieldMetadataItem.id,
         );