Wire fields widget to backend + basic edition (#17965)

Closes https://github.com/twentyhq/core-team-issues/issues/2215
Closes https://github.com/twentyhq/core-team-issues/issues/2216
Closes https://github.com/twentyhq/core-team-issues/issues/2218

## Fields widget edition demo


https://github.com/user-attachments/assets/08626d70-8fcb-4ae2-9222-10ef57e75f90

## Dashboards still work


https://github.com/user-attachments/assets/aa9a9c45-a0a2-481e-b132-bc52254778da

packages/twenty-front/src/modules/page-layout/constants/DefaultWorkflowVersionPageLayout.ts

@@ -3,6 +3,7 @@ import { type PageLayout } from '@/page-layout/types/PageLayout';
 import {
   PageLayoutTabLayoutMode,
   PageLayoutType,
+  WidgetConfigurationType,
   WidgetType,
 } from '~/generated-metadata/graphql';
 
@@ -51,8 +52,8 @@ export const DEFAULT_WORKFLOW_VERSION_PAGE_LAYOUT: PageLayout = {
           },
           configuration: {
             __typename: 'FieldsConfiguration',
-            configurationType: 'FIELDS',
-            sections: [],
+            configurationType: WidgetConfigurationType.FIELDS,
+            viewId: null,
           },
           createdAt: new Date().toISOString(),
           updatedAt: new Date().toISOString(),
@@ -90,8 +91,8 @@ export const DEFAULT_WORKFLOW_VERSION_PAGE_LAYOUT: PageLayout = {
           },
           configuration: {
             __typename: 'FieldsConfiguration',
-            configurationType: 'FIELDS',
-            sections: [],
+            configurationType: WidgetConfigurationType.FIELDS,
+            viewId: null,
           },
           createdAt: new Date().toISOString(),
           updatedAt: new Date().toISOString(),