Review project purging to avoid having projects without project users

[jyeshe]

Describe the bug

There were these projects without project users:

Version number

v2.10.16 (1.4.18)

I have reproduced this locally on main:

• Yes
• No

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to
happen.

Screenshots If applicable, add screenshots to help explain your problem.

Additional context Add any other context about the problem here.