sorted_common_packs - sort by priority packs, priority repos, then name
sorted_common_packs - sort by priority packs, priority repos, then name

this adds support for putting certain packs or repos earlier in the loaded packs order than they would otherwise have when sorted by name

priority packs go first - so that `manageiq-ui-classic/application-common.js` always goes first (after `vendor.js` which is special)
then go priority repos - so that `manageiq-ui-classic` packs get included before any plugins
then everything else, sorted by plugin-name/pack-name

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic