Update EndOfLifeTor.md with our latest end of life process

The draft is currently in: https://github.com/torproject/tor/pull/1062/files

Once #28453 (moved) merges, I will update the document with:

  • Update git scripts
  • Update Tor Travis Cron Jobs instructions
  • Jenkins test builds
  • Jenkins deb builds, including nightlies and experimental-(latest release), which needs to have a successful build before:
    • Debian website instructions, including JavaScript and no script lists
    • Chutney Travis CI
    • Stem Travis CI
    • sbws Travis CI (the sbws CI does not use multiple tor versions yet, so add a ticket number)