[Fix] fix timelineActivities on notes and tasks (#17814)

[Fixes
sentry](https://twenty-v7.sentry.io/issues/7238708876/?environment=prod&environment=prod-eu&project=4507072499810304&query=Field%20metadata%20for%20field&referrer=issue-stream&sort=date):
_Field metadata for field "targetTargetPersonId" is missing in object
metadata timelineActivity_

Regression caused by migration of note and task targets - fields were
renamed from personId to targetPersonId, impacting the event names,
while we still expected them in their previous shape.

---------

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Félix Malfait <FelixMalfait@users.noreply.github.com>

packages/twenty-server/src/modules/messaging/message-participant-manager/listeners/message-participant.listener.ts

@@ -5,7 +5,6 @@ import { isDefined } from 'twenty-shared/utils';
 import { Repository } from 'typeorm';
 
 import { OnCustomBatchEvent } from 'src/engine/api/graphql/graphql-query-runner/decorators/on-custom-batch-event.decorator';
-import { FeatureFlagKey } from 'src/engine/core-modules/feature-flag/enums/feature-flag-key.enum';
 import { FeatureFlagService } from 'src/engine/core-modules/feature-flag/services/feature-flag.service';
 import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 import { InjectObjectMetadataRepository } from 'src/engine/object-metadata-repository/object-metadata-repository.decorator';
@@ -74,17 +73,10 @@ export class MessageParticipantListener {
         .filter(isDefined);
     });
 
-    const isFeatureFlagTimelineActivityMigrated =
-      await this.featureFlagService.isFeatureEnabled(
-        FeatureFlagKey.IS_TIMELINE_ACTIVITY_MIGRATED,
-        batchEvent.workspaceId,
-      );
-
     await this.timelineActivityRepository.upsertTimelineActivities({
       objectSingularName: 'person',
       workspaceId: batchEvent.workspaceId,
       payloads: timelineActivityPayloads.filter(isDefined),
-      isFeatureFlagTimelineActivityMigrated,
     });
   }
 }