V16: Removes all generic Created, Saved, and Deleted notifications

[iOvergaard]

Description

The motivation behind this pull request is to put an end to the bloat of success notifications in the Backoffice. In former times, the Backoffice had a very subtle notification bar and thus could show notifications without bothering the user too much. With the new Backoffice, the notification bubble has become a lot more visible, but so have all other visual elements to tell the user that an action has succeeded or not.

This is why we think we can bluntly remove the (admittedly hardcoded) generic success notification bubbles for "Created", "Saved", and "Deleted".

The UI should reflect if the action has been completed in other ways, such as redirecting to the newly created entity automatically and/or updating the trees automatically.

[Copilot]

Pull Request Overview

This pull request removes the generic success notifications for "Created", "Saved", and "Deleted" actions in the Backoffice repository to reduce UI noise in the new design.

• Removed notification-related imports and context consumption.
• Deleted notification invocations within the create, update, and delete flows.

[Zeegaan]

Seems alot of the E2E tests are reliant on reading the success notifications, to ensure that the operation succeded 🙈
Maybe @nhudinh0309 can help fix these broken tests 😁
IMO, we could could as a start, just instead assert that there are no error notifications present...
Ideally, we would assert that the save button changes into a ✅ at some point, but I think that requires a lot of refactoring, and is probably better suited for another PR