Document Geo container list view regression

What does this MR do?

In GitLab 13.5, a regression was introduced that prevents users on a Geo secondary from viewing a list of container repositories and images. We were unable to backport the fix to 13.5. This MR documents the issue in Geo upgrade notes for 13.5.

Related issues

#285475 (closed) https://gitlab.com/gitlab-org/release/tasks/-/issues/1934

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