Use record page layouts in the merge records feature (#18961)

There was a design issue. It revealed that we weren't using record page
layouts in the merge records feature.

## Before

<img width="802" height="1283" alt="image"
src="https://github.com/user-attachments/assets/e4238144-e10e-47a6-83e6-7cc03ca89b15"
/>

## After


https://github.com/user-attachments/assets/c0fa9cf5-2b28-4696-bf20-8271dce9e62c

packages/twenty-front/src/modules/ui/layout/tab-list/types/LayoutCard.ts

@@ -1,7 +0,0 @@
-import { type CardConfiguration } from '@/object-record/record-show/types/CardConfiguration';
-import { type CardType } from '@/object-record/record-show/types/CardType';
-
-export type LayoutCard = {
-  type: CardType;
-  configuration?: CardConfiguration;
-};

packages/twenty-front/src/modules/ui/layout/tab-list/types/SingleTabProps.ts

@@ -1,4 +1,3 @@
-import { type LayoutCard } from '@/ui/layout/tab-list/types/LayoutCard';
 import { type IconComponent } from 'twenty-ui/display';
 
 export type SingleTabProps<T extends string = string> = {
@@ -8,6 +7,5 @@ export type SingleTabProps<T extends string = string> = {
   hide?: boolean;
   disabled?: boolean;
   pill?: string | React.ReactElement;
-  cards?: LayoutCard[];
   logo?: string;
 };