Clickhouse profiles/users options can't be customized

Configuring profiles via `extraConfig` does not work.
For example, after adding `profiles.default.join_use_nulls = 1` does not have any effect.

I think this might be caused by the `defaultExtraConfig` setting `user_directories.users_xml.path`, which causes Clickhouse to ignore user and profiles settings in the global config: https://clickhouse.com/docs/operations/configuration-files#user-settings.

I was able to work around it by overriding `user_directories.users_xml.path` to a path in `dataDir` and setting the options in there.