Remove access to unused WPS processes

[etj]

List of the processes used by mapstore (https://github.com/geosolutions-it/MapStore2/tree/master/web/client/observables/wps)

• gs:Aggregate
• gs:Bounds
• geo:buffer
• gs:CollectGeometries
• gs:DownloadEstimator
• gs:Download
• vec:Query
• gs:IntersectionFeatureCollection
• gs:LongitudinalProfile (??)
• gs:PagedUnique

List should be reviewed, checking if all the functionalities still work