report notifications for privileged users

Instead of `Pleroma.User.all_superusers()` we now use `Pleroma.User.all_superusers(:report_handle)`

I also changed it for sending emails, but there were no tests.

lib/pleroma/notification.ex

@@ -542,7 +542,8 @@ defmodule Pleroma.Notification do
   end
 
   def get_potential_receiver_ap_ids(%{data: %{"type" => "Flag", "actor" => actor}}) do
-    (User.all_superusers() |> Enum.map(fn user -> user.ap_id end)) -- [actor]
+    (User.all_users_with_privilege(:report_handle) |> Enum.map(fn user -> user.ap_id end)) --
+      [actor]
   end
 
   def get_potential_receiver_ap_ids(activity) do

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -392,11 +392,11 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
          _ <- notify_and_stream(activity),
          :ok <-
            maybe_federate(stripped_activity) do
-      User.all_superusers()
+      User.all_users_with_privilege(:report_handle)
       |> Enum.filter(fn user -> user.ap_id != actor end)
       |> Enum.filter(fn user -> not is_nil(user.email) end)
-      |> Enum.each(fn superuser ->
-        superuser
+      |> Enum.each(fn privileged_user ->
+        privileged_user
         |> Pleroma.Emails.AdminEmail.report(actor, account, statuses, content)
         |> Pleroma.Emails.Mailer.deliver_async()
       end)