chore: move plugins to their own repos and drop the plugins folder

.github/workflows/beta-release.yml

@@ -84,16 +84,12 @@ jobs:
       - name: Type check
         run: npm run type-check
 
-      # Before the tests: the plugin boot tests load the built bundles.
       - name: Build
         run: npm run build
 
       - name: Run unit tests
         run: npm run test
 
-      - name: Run plugin tests
-        run: npm run test:plugins
-
   create-release:
     needs: [prep, verify]
     if: ${{ needs.prep.outputs.dev_branch != '' && inputs.dry_run != true }}