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/metadata-modules/flat-role/utils/from-role-entity-to-flat-role.util.ts

@@ -20,5 +20,6 @@ export const fromRoleEntityToFlatRole = (role: RoleEntity): FlatRole => {
     canBeAssignedToApiKeys: role.canBeAssignedToApiKeys,
     workspaceId: role.workspaceId,
     universalIdentifier: role.standardId || role.id,
+    applicationId: role.applicationId ?? null,
   };
 };