Geo: Ensure a secondary can download Project Repositories on the primary when using project_repositories based replication`

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Based on the instructions for adding a new replicable, for project_repositories based replication, we want to:

Make sure a Geo secondary site can request and download Cool Widgets on the Geo primary site. You may need to make some changes to Gitlab::GitAccessCoolWidget. For example, see this change for Group-level Wikis.