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/apollo/types/coreObjectNamesToDeleteOnRelationDetach.ts

@@ -2,6 +2,7 @@ import { CoreObjectNameSingular } from '@/object-metadata/types/CoreObjectNameSi
 
 export const CORE_OBJECT_NAMES_TO_DELETE_ON_TRIGGER_RELATION_DETACH = [
   CoreObjectNameSingular.Favorite,
-  CoreObjectNameSingular.ActivityTarget,
+  CoreObjectNameSingular.NoteTarget,
+  CoreObjectNameSingular.TaskTarget,
   CoreObjectNameSingular.Comment,
 ];