slapos_jio,slapos_erp5: move WebSection_getHostingJSPrecacheManifestList

slapos_jio,slapos_erp5: move WebSection_getHostingJSPrecacheManifestList from slapos_hal_json_style to slapos_base portal_skins

this script is needed to generate translation data so it must be in a directory available in all skin selections