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/utils/__test__/get-field-metadata-entity.mock.ts

@@ -1,6 +1,7 @@
 import { faker } from '@faker-js/faker';
 import { type FieldMetadataType } from 'twenty-shared/types';
 
+import { type ApplicationEntity } from 'src/engine/core-modules/application/application.entity';
 import { type FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
 import { type IndexFieldMetadataEntity } from 'src/engine/metadata-modules/index-metadata/index-field-metadata.entity';
 import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
@@ -49,6 +50,9 @@ export const getMockFieldMetadataEntity = <
     createdAt: new Date(),
     updatedAt: new Date(),
     isActive: true,
+    application: {} as ApplicationEntity,
+    applicationId: faker.string.uuid(),
+    universalIdentifier: faker.string.uuid(),
     ...overrides,
   };
 };

packages/twenty-server/src/utils/__test__/get-object-metadata-entity.mock.ts

@@ -1,5 +1,6 @@
 import { faker } from '@faker-js/faker';
 
+import { type ApplicationEntity } from 'src/engine/core-modules/application/application.entity';
 import { type DataSourceEntity } from 'src/engine/metadata-modules/data-source/data-source.entity';
 import { type ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 
@@ -41,8 +42,9 @@ export const getMockObjectMetadataEntity = (
     objectPermissions: [],
     shortcut: null,
     standardId: null,
-    applicationId: null,
-    application: null,
+    universalIdentifier: faker.string.uuid(),
+    applicationId: faker.string.uuid(),
+    application: {} as ApplicationEntity,
     targetRelationFields: [],
     standardOverrides: null,
     targetTableName: faker.string.uuid(),