Deleted private user from private assembly still follows assembly and its components

[Stef-Rousset]

Describe the bug

As a private user of a private assembly, I follow the assembly and for example one of its meetings.
When the admin deletes me as a private user, I still follows this assembly and the meeting.

To Reproduce

1. As an admin, add a private user to an assembly that is private and not transparent.
2. As the user added to this assembly, follow the assembly and follow one of its meeting.
3. As an admin, delete the private user added.
4. As an admin, go to the assembly and see that the numbers of followers didn't change on the assembly and on the meeting.

To confirm that the user is still a follower, you can also :

1. As an admin, change the assembly to transparent.
2. As a user, see that you still follow the assembly and the meeting.

Expected behavior

As an admin, if I delete a private user from a non transparent assembly, I expect that the user is also deleted from the followers of the assembly and its components.

Screenshots

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Stacktrace

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Extra data

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Additional context

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