Support :single as select_variant for TreeView - #3712

Support :single as select_variant for TreeView#3712

HDinger wants to merge 2 commits into

primer:mainprimer/view_components:mainfrom

opf:feature/single-select-variant-for-tree-viewopf/primer_view_components:feature/single-select-variant-for-tree-viewCopy head branch name to clipboard