Upload flat project archive after hybrid execution

[4e6]

Pull Request Description

closes https://github.com/enso-org/cloud-v2/issues/2082

Changelog:

• update: gui downloads and unpacks the project structure as is, but always uploads the flat archive (without the project_root. This means that project_root/project_root can exist on the first run, but on the next run it will be fixed.

Important Notes

Tested manually.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  TypeScript,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• Unit tests have been written where possible.
• If meaningful changes were made to logic or tests affecting Enso Cloud integration in the libraries,
  or the Snowflake database integration, a run of the Extra Tests has been scheduled.
  • If applicable, it is suggested to paste a link to a successful run of the Extra Tests.

[4e6]

@somebody1234 can you do the QA please