Hide confidential events in ruby
We're filtering the events using `Event#visible_to_user?`. At most we're loading 100 events at once. Pagination is also dealt with in the finder, but the resulting array is wrapped in a `Kaminari.paginate_array` so the API's pagination helpers keep working. We're passing the total count into that paginatable array, which would include confidential events. But we're not disclosing anything.
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