Fix Arel deprecation warning in clusters_hierarchy
As mentioned in https://github.com/rails/rails/pull/29619, this removes this stream of deprecation warnings:
Delegating join_sources to arel is deprecated and will be removed in
Rails 6.0. (called from project_clusters_base_query at
/builds/gitlab-org/gitlab-ce/app/models/clusters/clusters_hierarchy.rb:62)
Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/61451
Edited by Stan Hu