It's been on test wikis for ~ a decade now with no signs of life. Let's drop it?
[x] Patch operations/mediawiki-config to no longer load this extension in production nor on the beta cluster
[ ] Remove the extension from [[https://gitlab.wikimedia.org/repos/releng/release/-/blob/main/make-release/settings.yaml?ref_type=heads|the production release list]]
[x] Patch integration repo to remove things like `in-wikimedia-production`
[x] Remove {{OnWikimedia}} from https://www.mediawiki.org/wiki/Extension:Capiunto ([[https://www.mediawiki.org/w/index.php?title=Extension:Capiunto&diff=prev&oldid=8026623|edit]])
[x] Remove extension from https://www.mediawiki.org/wiki/Developers/Maintainers ([[https://www.mediawiki.org/w/index.php?diff=8026628|edit]])
https://codesearch.wmcloud.org/search/?q=Capiunto