When disk space is exhausted due to the project size, discarding the changes doesn't clear `SessionData`

### Bug description

_No response_

### Steps to reproduce

1. Create a new project
2. Bloat the project file size so that the disk space is exhausted
3. Observe: "disk is full" message pops up
4. Click [OK]
5. Close the project without saving
6. Observe

### Expected behavior

After the project is closed without saving, the temporary project file in `SessionData` directory should be deleted.
The user then can proceed with using Audacity as normal.

### Actual behavior

After the project is closed without saving, the temporary project file in the' SessionData' directory remains.
The user is blocked from using Audacity and sees the message saying the config file can't be accessed.

### Audacity Version

Audacity 3.7.1

### Operating system

macOS

### Additional context

_No response_