Investigate/Remove dead learn gitlab links
During cleanup of another link, it was noticed that there maybe other links that aren't reachable that need cleaned up on learn gitlab as well.
- see #390257 (comment 1267529912) for more context
The following discussion from !111208 (merged) should be addressed:
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@dstull started a discussion: (+4 comments) @nicolasdular can you please review backend?
Edited by Doug Stull