Cloud dispatch & fixes

[mwu-tow]

Pull Request Description

This PR updates the build script:

• fixed issue where program version check was not properly triggering;
• improved git-clean command to correctly clear Scala artifacts;
• added run.ps1 wrapper to the build script that works better with PowerShell than run.cmd;
• increased timeouts to work around failures on macOS nightly builds;
• replaced depracated GitHub Actions APIs (set-output) with their new equivalents;
• workaround for issue with electron builder (python2 lookup) on newer macOS runner images;
• GUI and backend dispatches to cloud were completed;
• release workflow allows creating RC releases.

Important Notes

Checklist

Please include the following checklist in your PR:

• The documentation has been updated if necessary.
• All code conforms to the
  Scala,
  Java,
  and
  Rust
  style guides.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed: Enso GUI was tested when built using BOTH
    ./run ide build and ./run ide watch.