refactor(ci): fix npm workflows (#4797)

* 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

.github/workflows/npm-brew.yaml

@@ -16,13 +16,18 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - uses: actions/download-artifact@v2
+        id: download
+        with:
+          name: "npm-package"
+          path: release-npm-package
+
       - name: Publish npm package and tag with "latest"
         run: yarn publish:npm
         env:
-          ENVIRONMENT: "production"
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
-          NPM_TAG: "latest"
+          NPM_ENVIRONMENT: "production"
 
   homebrew:
     # The newest version of code-server needs to be available on npm when this runs