CkanCatalogGroup should handle filterQuery correctly

[mwu2018]

The current implementation assumes that each element in filterQuery array of CkanCatalogGroup is an Object that has key-value pair such as

{
  "fq": "(organization:alpine-shire-council AND res_format:(geojson OR GeoJSON OR kml OR KML OR kmz OR KMZ OR wms OR WMS OR CSV-GEO-AU OR csv-geo-au OR aus-geo-csv OR \"Esri REST\"))"
}

However, an array element can also be a pure query string such as

  "fq=+(res_format%3Awms%20OR%20res_format%3AWMS)"

The code should also handle that case.

[mwu2018]

Changed to medium priority as this will not impact vic dt anymore. However, it is required for v8 national map.

[nf-s]

Closed by #5332