Activity as standard object (#6219)

In this PR I layout the first steps to migrate Activity to a traditional
Standard objects

Since this is a big transition, I'd rather split it into several
deployments / PRs

<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/012e2bbf-9d1b-4723-aaf6-269ef588b050">

---------

Co-authored-by: Charles Bochet <charles@twenty.com>
Co-authored-by: bosiraphael <71827178+bosiraphael@users.noreply.github.com>
Co-authored-by: Weiko <corentin@twenty.com>
Co-authored-by: Faisal-imtiyaz123 <142205282+Faisal-imtiyaz123@users.noreply.github.com>
Co-authored-by: Prateek Jain <prateekj1171998@gmail.com>

packages/twenty-front/src/modules/views/view-picker/components/ViewPickerListContent.tsx

@@ -1,6 +1,6 @@
-import { MouseEvent, useCallback } from 'react';
 import styled from '@emotion/styled';
 import { DropResult } from '@hello-pangea/dnd';
+import { MouseEvent, useCallback } from 'react';
 import { useSetRecoilState } from 'recoil';
 import { IconLock, IconPencil, IconPlus, useIcons } from 'twenty-ui';
 
@@ -84,6 +84,22 @@ export const ViewPickerListContent = () => {
   return (
     <>
       <DropdownMenuItemsContainer>
+        {indexView && (
+          <MenuItemDraggable
+            key={indexView.id}
+            iconButtons={[
+              {
+                Icon: IconLock,
+              },
+            ].filter(isDefined)}
+            isIconDisplayedOnHoverOnly={false}
+            onClick={() => handleViewSelect(indexView.id)}
+            LeftIcon={getIcon(indexView.icon)}
+            text={indexView.name}
+            accent="placeholder"
+            isDragDisabled
+          />
+        )}
         <DraggableList
           onDragEnd={handleDragEnd}
           draggableItems={viewsOnCurrentObject.map((view, index) => (