Introducing view field group syncable entity (#17867)

## Context
Introduces a new viewFieldGroup entity that allows grouping view fields
into sections (e.g. "General", "Additional", "Other") within a view.

The page layout fields widget needs a way to organize fields into
sections. Today, views have no concept of field grouping. This PR
introduces the viewFieldGroup entity which sits between a view and its
viewFields, enabling section-based organization.

<img width="401" height="724" alt="Layout - V2 (customize visibility)"
src="https://github.com/user-attachments/assets/6376e2ab-44db-42bf-9d2c-758f56f6b548"
/>

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/generated/graphql.ts

@@ -775,6 +775,7 @@ export type CoreView = {
   shouldHideEmptyGroups: Scalars['Boolean'];
   type: ViewType;
   updatedAt: Scalars['DateTime'];
+  viewFieldGroups: Array<CoreViewFieldGroup>;
   viewFields: Array<CoreViewField>;
   viewFilterGroups: Array<CoreViewFilterGroup>;
   viewFilters: Array<CoreViewFilter>;
@@ -799,6 +800,20 @@ export type CoreViewField = {
   workspaceId: Scalars['UUID'];
 };
 
+export type CoreViewFieldGroup = {
+  __typename?: 'CoreViewFieldGroup';
+  createdAt: Scalars['DateTime'];
+  deletedAt?: Maybe<Scalars['DateTime']>;
+  id: Scalars['UUID'];
+  isVisible: Scalars['Boolean'];
+  name: Scalars['String'];
+  position: Scalars['Float'];
+  updatedAt: Scalars['DateTime'];
+  viewFields: Array<CoreViewField>;
+  viewId: Scalars['UUID'];
+  workspaceId: Scalars['UUID'];
+};
+
 export type CoreViewFilter = {
   __typename?: 'CoreViewFilter';
   createdAt: Scalars['DateTime'];