chore(183909391): Remove existing Cloud dashboard code

[indiv0]

Pull Request Description

Given that we have decided to go with a React-based approach for the combined IDE & Cloud UI, the cloud_dashboard written in EnsoGL is no longer applicable and is being removed. The bug fixes and refactors from that code that are still relevant have been separated into the following, smaller, PRs:

https://github.com/enso-org/cloud-v2/pull/116
https://github.com/enso-org/cloud-v2/pull/117
https://github.com/enso-org/cloud-v2/pull/118
https://github.com/enso-org/cloud-v2/pull/119

Meanwhile, the cloud_dashboard crate itself is being removed from the enso repo to ease future maintainability burdens.

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.

[wdanilo]

Does it also remove all JS styles/things inserted to the codebase to make the Rust-based cloud dashboard working? I understand that the new implementation is on separate repo, so all CSS styles and JS changes introduced because of the Rust dashboard can be reverted now.

[indiv0]

Does it also remove all JS styles/things inserted to the codebase to make the Rust-based cloud dashboard working? I understand that the new implementation is on separate repo, so all CSS styles and JS changes introduced because of the Rust dashboard can be reverted now.

Unless I'm misunderstanding, we never added JS styles, only stylewatch styles, which were being added in the previously closed PR so they're not a concern.