security: Remove unnecessary Supabase secrets from Lighthouse CI step

- Remove NEXT_PUBLIC_SUPABASE_URL, NEXT_PUBLIC_SUPABASE_ANON_KEY, and SUPABASE_SERVICE_ROLE_KEY
- These environment variables are not used by lhci command
- Follows principle of least privilege to prevent accidental exposure
- Service role key should never be present in client contexts

Author: Deepak Pandey

.github/workflows/ci-cd.yml

@@ -595,9 +595,6 @@ jobs:
           LHCI_GITHUB_APP_TOKEN: ${{ secrets.LHCI_GITHUB_APP_TOKEN }}
           LHCI_TOKEN: ${{ secrets.LHCI_TOKEN }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          NEXT_PUBLIC_SUPABASE_URL: ${{ secrets.NEXT_PUBLIC_SUPABASE_URL }}
-          NEXT_PUBLIC_SUPABASE_ANON_KEY: ${{ secrets.NEXT_PUBLIC_SUPABASE_ANON_KEY }}
-          SUPABASE_SERVICE_ROLE_KEY: ${{ secrets.SUPABASE_SERVICE_ROLE_KEY }}
 
       - name: Upload performance results
         uses: actions/upload-artifact@v4