Also check if the product has the health extension enabled (#1940)

We were checking the device extension settings, but not the product.

Part 1 of #1939

lib/nerves_hub_web/live/devices/show.ex

@@ -490,15 +490,21 @@ defmodule NervesHubWeb.Live.Devices.Show do
       |> Map.keys()
       |> Enum.map(&to_string/1)
 
-  defp schedule_health_check_timer(%{assigns: %{device: device}} = socket) do
-    if connected?(socket) and device.extensions.health do
+  defp schedule_health_check_timer(socket) do
+    %{device: device, product: product} = socket.assigns
+
+    if connected?(socket) and health_extension_enabled?(product, device) do
       timer_ref = Process.send_after(self(), :check_health_interval, 500)
       assign(socket, :health_check_timer, timer_ref)
     else
       assign(socket, :health_check_timer, nil)
     end
   end
 
+  defp health_extension_enabled?(product, device) do
+    product.extensions.health and device.extensions.health
+  end
+
   defp audit_log_assigns(
          %{assigns: %{device: device, page_number: page_number, page_size: page_size}} = socket
        ) do