Confusing error connecting to workspace marked "pending deletion"

Trying to connect to a workspace which is pending deletion results in this error:

```
API POST to 'https:///api/v2/workspaces/fbcd97fa-2b0f-4eea-87fd-c3b343633071/builds' failed.
Status code: 403
Message: insert workspace build
Detail: authorize context: unauthorized: rbac: forbidden
```

Reactivating the workspace makes it possible to connect.

Ideally this would remove the pending deletion automatically, or inform the user how to do so.