Hard delete of items in Trash

[somebody1234]

Pull Request Description

• Close https://github.com/enso-org/cloud-v2/issues/698
  • Requires https://github.com/enso-org/cloud-v2/pull/905

Important Notes

None

Screenshots

"Clear Trash" button (only when in Trash category):

"Delete Forever" context menu option:

"Delete All Forever" context menu option:

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,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.

[somebody1234]

done basic testing, seems to work with the new backend fixes.

[somebody1234]

(both individual delete and "clear trash" - which makes sense because both use the same endpoint.)

[indiv0]

LGTM, QA passed ✅