chore(repo): remove dead code and useless tests (#3375)

.github/workflows/build-desktop.yaml

@@ -740,7 +740,6 @@ jobs:
       PUBLIC_BUILD_VERSION: ${{ needs.meta.outputs.version }}
       PUB_DATE: ${{ needs.meta.outputs.pub_date }}
       SOURCE_SHA: ${{ needs.meta.outputs.source_sha }}
-      PUBLIC_DL_BASE: https://api.fluxer.app/dl
     steps:
       - name: Checkout source
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1