[Bug]: Deleted projects and actors are unintelligible in Events UI #3420

Steps to reproduce

1. Create a user.
2. Create a project as that user.
3. Delete the project.
4. Delete the user.
5. View the events page.

Actual behaviour

Unlike other deleted entities that preserve their names, deleted actors and projects are displayed with an automatically generated name substitute.

This makes it difficult to investigate incidents.

Expected behaviour

• Show the original names of deleted actors and projects.
• Do not add hyperlinks to user and project details of deleted actors and projects — such links could unintentionally lead to newly created users and projects with the same name.
• Use some visual element (e.g., a bin icon or a text label) to show that the actor or the project is deleted.

Implementing this in the UI requires some API updates:

• Return the original names of deleted actors and projects.
• Add a flag indicating that the user or the project was deleted.

dstack version

0.20.0

Server logs

Additional information

No response