fix: duplicate merge button bug (#15284)

Fixes - https://github.com/twentyhq/twenty/issues/15263

- Replaced `useLoadSelectedRecordsInContextStore` with
`useLoadMergeRecords` in `useOpenMergeRecordsPageInCommandMenu` for
improved functionality.
- Updated `useMergePreview`, `useMergeRecordsActions`, and
`useMergeRecordsSettings` to utilize `mergeRecordsState` instead of the
deprecated context store hook.
- Cleaned up imports and ensured consistency across merge-related hooks.


https://github.com/user-attachments/assets/453539c9-7f2b-4e8c-bfa1-3ceebca07081

---------

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

packages/twenty-front/src/modules/command-menu/components/CommandMenuRouter.tsx

@@ -1,6 +1,5 @@
 import { ActionMenuContextProvider } from '@/action-menu/contexts/ActionMenuContextProvider';
 import { CommandMenuContainer } from '@/command-menu/components/CommandMenuContainer';
-import { CommandMenuContextChipRecordSetterEffect } from '@/command-menu/components/CommandMenuContextChipRecordSetterEffect';
 import { CommandMenuTopBar } from '@/command-menu/components/CommandMenuTopBar';
 import { COMMAND_MENU_PAGES_CONFIG } from '@/command-menu/constants/CommandMenuPagesConfig';
 import { commandMenuPageInfoState } from '@/command-menu/states/commandMenuPageInfoState';
@@ -31,7 +30,6 @@ export const CommandMenuRouter = () => {
 
   return (
     <CommandMenuContainer>
-      <CommandMenuContextChipRecordSetterEffect />
       <CommandMenuPageComponentInstanceContext.Provider
         value={{ instanceId: commandMenuPageInfo.instanceId }}
       >