Follow up to T256054: Copy dependencies of "jquery.wikibase.linkitem" Resource Loader module to Wikibase client JS code. As part of decoupling client and repo, and their frontend code.
This config value is polymorphic and behaves differently under a client or a repo while pretending to be a universal configuration value, also it was made before federation and doesn't consider commons to be a repo at all.
This should be split and client and repo define their own values and use that instead and have more than one repo in it.