chore: remove unused unused job

This crucial part of this workflow was removed in
278e667, we should have removed the entire job.

.github/workflows/main.yml

@@ -47,20 +47,6 @@ jobs:
         run: |
           npm run lint
 
-  unused:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
-        with:
-          node-version: "lts/*"
-          cache: "npm"
-      - name: Install dependencies
-        run: |
-          npm ci
-        env:
-          PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: 1
-
   browser-test:
     runs-on: ubuntu-latest
     steps: