Fix broken metadata sync due to index removal (#11706)

Changing strategy regarding disabling index creation with new relation
system

packages/twenty-server/.env.example

@@ -4,7 +4,6 @@ PG_DATABASE_URL=postgres://postgres:postgres@localhost:5432/default
 REDIS_URL=redis://localhost:6379
 APP_SECRET=replace_me_with_a_random_string
 SIGN_IN_PREFILLED=true
-SYNC_METADATA_INDEX_ENABLED=false
 
 FRONTEND_URL=http://localhost:3001