Delete todos OWNED by bot users

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In GitLab we have different user types: https://gitlab.com/gitlab-org/gitlab/-/blob/63dce8b8e15ece052e81a5666301187c2bf8ef41/app/models/concerns/has_user_type.rb#L6-43

It seems like about ~6% of todos are OWNED by bot users:

SELECT "todos".id FROM  "todos"  LEFT JOIN users ON todos.user_id= users.id WHERE  "users"."user_type" > 0

While it makes sense that a bot user can create todos, owning not as much.

We probably should:

1. Consider adding tracing to see whether we have any bot user using todos
2. Prevent creation of new todos for those users
3. Delete the todos created for those users