Update upload-update_responses-to-staticiforme step for new tor-browser-update-responses repository

With tor-browser#41443 (closed) we created a new git repository for update-responses.

Following that I think we should replace the current signing/release step upload-update_responses-to-staticiforme with:

• a new step that will extract the update-responses files to a local clone of the tor-browser-update-responses repository, and maybe also create a new commit and push it (unless we want to do that part manually, with MRs?)
• a script to be run manually at the end of the release process to deploy the new commit on staticiforme, taking the new commit hash as argument and doing the following:
  • ssh to staticiforme,
  • use sudo to become the tb-release user (after tpo/tpa/team#41019 (closed) is done)
  • git checkout the new commit
  • run static-update-component aus1.torproject.org

/cc @richard