Support unhiding of all refs for Geo Nodes

Stan Hurequested to merge
sh-show-all-refs into master

By default, we hide certain refs (e.g. keep-around/XXX) to save user download time. We need to preserve these references on secondary Geo nodes to have a true copy.

Relates to gitlab-org/gitlab-ee!2489

Closes gitlab-org/gitlab-ee#2959

Edited by Stan Hu

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