Fix JIRA DVCS retrieving repositories

Retrieving repositories from personal namespace on GitLab.com results in
an error. This is a regression introduced in f755a5ff.

The intent was to return all projects for instance admins but we don't
need to include public projects for regular users.

changelogs/unreleased/37012-jira-dvcs-error.yml

+---
+title: Fix JIRA DVCS retrieving repositories
+merge_request: 23180
+author:
+type: fixed

ee/lib/api/v3/github.rb

@@ -117,8 +117,8 @@ module API
           namespace = Namespace.find_by_full_path(params[:namespace])
           not_found!('Namespace') unless namespace && licensed?(namespace)
 
-          projects = Project.public_or_visible_to_user(current_user)
-                            .in_namespace(namespace.self_and_descendants)
+          projects = current_user.can_read_all_resources? ? Project.all : current_user.authorized_projects
+          projects = projects.in_namespace(namespace.self_and_descendants)
                              .eager_load_namespace_and_owner
                              .with_route