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HUE-2412 [core] partially optimize the desktop home view

This cuts the rendering time from the home view from 17s to 11s.
HUE-2415 [core] Expose a 'is_alive' route a load balancer can poll

This allows '/desktop/debug/is_alive' route that the load balancer can
submit a 'HEAD' request to in order to verify the application server is
alive.