CS-10688: Add selected items summary section to Picker dropdown#4367

FadhlanR wants to merge 5 commits intomaincardstack/boxel:mainfrom

cs-10688-defer-reordering-selected-items-to-top-until-dropdown-is-reopenedcardstack/boxel:cs-10688-defer-reordering-selected-items-to-top-until-dropdown-is-reopenedCopy head branch name to clipboard