I talked with hashar on IRC about my patch https://gerrit.wikimedia.org/r/#/c/406524/ and he told me to mediawiki/extensions/Collection/OfflineContentGenerator/node_modules should be archived and per it, I would to it should be archived:
- Remove from mediawiki/extensions ( along with in .gitmodules)
- Remove tests in integration/config ( zuul/layout.yaml )
- Empty repository and add a ARCHIVED file.
- Mark the repository read-only in Gerrit: https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/Collection/OfflineContentGenerator/node_modules