This bugfix was added with a feature flag. After it has deployed on production with T223303: on production enable bugfix for wbeditentity setting aliases to empty array, this feature flag can be removed.
acceptance criteria
- feature flag is no longer present in production code
- feature flag is no longer present in tests
- feature flag is no longer present in config (Wikibase.php, InitialiseSettings.php, InitialiseSettings-labs.php)