* feat: refactor npm workflows to use download-artifact
This refactors the npm workflows to use the download-artifact GitHub Action. We
had problems in the past with our download_artifact custom bash function. This
also fixes an issue where we weren't downloading the correct artifacts when
publishing beta and dev tags to npm.
* fixup: remove unused env var
* fixup! add download-artifcat to npm-brew"
* fixup! remove unnecessary code comment
* fixup! move NPM_ENVIRONMENT logic to script