queue preview: display spinner while loading data
Shard queue (https://intel-gfx-ci.01.org/queue/index.html) with 20+ entries takes about 10s to load for me.
This is the case as it need to do multiple trips to patchwork to get details on the tested series.
We should display a spinner and replace it with either results or error message in case of failures when the fetching is done.
Bonus points: a) adding spinners for BAT queues, they do only single request which is pretty quick so this is not that important b) populating and reordering (sorting) shards queue as we get more data, so people see how the data is fetch real time