Fixes #86681 and #86015 by 1) centralizing the file name genaration in the the UrlExporter parent class and 2) setting the extension for shp downloads to zip.
Merge pull request #224 from luisromangz/86015_86681-NameAndExtensionOfExportedLayersFiles

Fixes #86681 and #86015 by 1) centralizing the file name genaration in t...