cherry-pick fix(skills): add igx-buttongroup and icon button to igniteui-angular-…#17024

zdrawku wants to merge 2 commits intomasterIgniteUI/igniteui-angular:masterfrom

zkolev/promote-btn-group-skill-changesIgniteUI/igniteui-angular:zkolev/promote-btn-group-skill-changesCopy head branch name to clipboard