Migrate pagelayout position frontend (#18229)

## Context
Part 1 of migrating gridPosition in favor of typed position
FE should now always send both values to the BE and use both.

Next steps: 
- Update the backend to enforce and validate the new position field + DB
migrations gridPositon -> position (type: GRID)
- Cleanup frontend usage
- Cleanup backend

packages/twenty-front/src/modules/page-layout/utils/convertPageLayoutDraftToUpdateInput.ts

@@ -1,6 +1,9 @@
 import { type DraftPageLayout } from '@/page-layout/types/DraftPageLayout';
 import { isDynamicRelationWidget } from '@/page-layout/utils/isDynamicRelationWidget';
-import { type UpdatePageLayoutWithTabsInput } from '~/generated-metadata/graphql';
+import {
+  PageLayoutTabLayoutMode,
+  type UpdatePageLayoutWithTabsInput,
+} from '~/generated-metadata/graphql';
 
 export const convertPageLayoutDraftToUpdateInput = (
   pageLayoutDraft: DraftPageLayout,
@@ -27,6 +30,14 @@ export const convertPageLayoutDraftToUpdateInput = (
             rowSpan: widget.gridPosition.rowSpan,
             columnSpan: widget.gridPosition.columnSpan,
           },
+          position: {
+            layoutMode:
+              widget.position?.layoutMode ?? PageLayoutTabLayoutMode.GRID,
+            row: widget.gridPosition.row,
+            column: widget.gridPosition.column,
+            rowSpan: widget.gridPosition.rowSpan,
+            columnSpan: widget.gridPosition.columnSpan,
+          },
           configuration: widget.configuration ?? null,
         })),
     })),