Fix/deleted users follow

[Stef-Rousset]

:tophat: What? Why?

When a private user of a non transparent private assembly is deleted, its follows of assembly or its components are also deleted

:pushpin: Related Issues

• Fixes issue 12851

Testing

1. As an admin, edit an assembly and make it private and non transparent (in the Visibility tab)
2. If there is no meeting, add a meeting component to it
3. Invite "user@example.org" as a private user of this assembly
4. As a user, access to the private assembly and click on the follow button
5. Go to the meeting inside assembly and follow it
6. As an admin, delete the private user "user@example.org"
7. As a user, check that you can’t access to the private assembly anymore
8. As an admin, add again "user@example.org" as a private user
9. As a user, go to the assembly and see that your follow has been deleted
10. As a user, go to the meeting and see that your follow has also been deleted

:hearts: Thank you!