Add applicationId to syncableEntity and fix syncApp deletion (#15170)

## Context
- All flatEntity should extend SyncableEntity
- SyncableEntity should now have applicationId and application relation
- Fix syncApp deletion, should now properly use migration v2 to delete
syncable entities

packages/twenty-server/src/engine/workspace-manager/workspace-migration-v2/services/workspace-migration-build-orchestrator.service.ts

@@ -127,6 +127,14 @@ export class WorkspaceMigrationBuildOrchestratorService {
                   ...flatFieldMetadataMaps?.from.idByUniversalIdentifier,
                   ...flatFieldMetadataMaps?.to.idByUniversalIdentifier,
                 },
+                universalIdentifiersByApplicationId: {
+                  ...dependencyAllFlatEntityMaps?.flatFieldMetadataMaps
+                    ?.universalIdentifiersByApplicationId,
+                  ...flatFieldMetadataMaps?.from
+                    .universalIdentifiersByApplicationId,
+                  ...flatFieldMetadataMaps?.to
+                    .universalIdentifiersByApplicationId,
+                },
               },
             },
             ///