feat: add updatedBy field to track last record modifier (#16807)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Implements last-modifier tracking and unified actor injection.
> 
> - New `ActorFromAuthContextService` replaces createdBy-only logic;
pre-query hooks now inject both `createdBy` and `updatedBy` on create
and `updatedBy` on update
> - Add `updatedBy` standard field to core/custom objects (e.g.,
`person`, `company`, `task`, `note`, `attachment`, `dashboard`,
`workflow`, `workflowRun`) with IDs, metadata builders, and ORM entity
fields
> - Record CRUD: `create` now sets both `createdBy` and `updatedBy`;
`update` sets `updatedBy`; workflow actions use a shared workflow actor
builder; REST base handler uses the new actor service
> - Seeder data and snapshots updated to include `updatedBy`; GraphQL
result formatting adds defaults/handling for empty composite fields
(incl. actor)
> - Frontend `useUpdateOneRecord` upserts returned record into the local
store after mutation
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
1f283778e9. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>
Co-authored-by: Félix Malfait <felix@twenty.com>

packages/twenty-server/src/modules/task/standard-objects/task.workspace-entity.ts

@@ -133,6 +133,16 @@ export class TaskWorkspaceEntity extends BaseWorkspaceEntity {
   @WorkspaceIsFieldUIReadOnly()
   createdBy: ActorMetadata;
 
+  @WorkspaceField({
+    standardId: TASK_STANDARD_FIELD_IDS.updatedBy,
+    type: FieldMetadataType.ACTOR,
+    label: msg`Updated by`,
+    icon: 'IconUserCircle',
+    description: msg`The workspace member who last updated the record`,
+  })
+  @WorkspaceIsFieldUIReadOnly()
+  updatedBy: ActorMetadata;
+
   @WorkspaceRelation({
     standardId: TASK_STANDARD_FIELD_IDS.taskTargets,
     label: msg`Relations`,