Addresses the issue with `yarn upgrade-interactive` documented by @benschac in ENG-1063: https://linear.app/comm/issue/ENG-1063/yarn-upgrade-interactive-functionality-errors
Basically, found that `yarn upgrade-interactive` failed in every yarn workspace **except for keyserver**. Was wondering what might be different, and remembered that we had to add an entry to `keyserver/.npmrc` in order for things to work there (https://phabricator.ashoat.com/D2966) in the past.
Tried moving `.npmrc` to the root of the repo and `yarn upgrade-interactive` worked fine without errors. I don't have much context on why we needed the `.npmrc` in the first place, but remember there was some weirdness with matrix/gitlab/etc... (would be good to get @marcinwasowicz's perspective here).