feat(permissions): incomplete permission removal with “Removed shared project” TASK-1494

[Guitlle]

🗒️ Checklist

1. run linter locally
2. update all related docs (API, README, inline, etc.), if any
3. draft PR with a title <type>(<scope>)<!>: <title> TASK-1234
4. tag PR: at least frontend or backend unless it's global
5. fill in the template below and delete template comments
6. review thyself: read the diff and repro the preview as written
7. open PR & confirm that CI passes
8. request reviewers, if needed
9. delete this section before merging

📣 Summary

Add a new endpoint to delete all the permissions for a user by deleting any one of the user permissions

👀 Preview steps

1. Login as a user (user A)
2. Create or use an existing project to share it with another user (user B)
3. Log in as user B and go to the project page,
4. Go to the "Form" tab, and in the three dots button, in the top right corner, click on the option "Remove shared project"
5. Log out
6. Log in as user A and check the project sharing settings, the user B should not appear anymore.

[RuthShryock]

Works well!