ya-provider/facade/runtime process stopping issues

[pwalski]

ToDo:

• [x] Issue of waiting for Automatic process to stop in ya-runtime-ai
  • [x] Problem with delayed shutdown when downloading a model (ya-provider will kill the process after timeout in anyway, but it would be better to do it on initial ctrl-break) - test if it even is the case.
• [x] Issue of sequential stopping Yagna & Provider in gh facade (PR https://github.com/golemfactory/gamerhash-facade/pull/54 for now includes only runtime & yagna version updates)
• [x] Issue with exe-unit process handling on Windows (PR resolving it https://github.com/golemfactory/yagna/pull/3027)

Additional Todo:

• [ ] ya-runtime-ai Automatic related parameters in descriptor
  • Add parameters (both cmdline and env vars?) to override default path to Automatic and some overrides for default timeouts.
  • Some cleanup of main.rs / tests