feat(webui): extend shared explorer tree actions

webui/tsconfig.component-tests.json

@@ -20,6 +20,7 @@
   "include": [
     "tests/data-grid-actions.test.tsx",
     "tests/dialog-focus.test.tsx",
+    "tests/explorer-tree.test.tsx",
     "tests/icon-button.test.tsx",
     "tests/mail-components.test.tsx",
     "tests/resource-access-explanation.test.tsx",
@@ -34,6 +35,7 @@
     "src/components/Button.tsx",
     "src/components/DismissibleAlert.tsx",
     "src/components/Dialog.tsx",
+    "src/components/ExplorerTree.tsx",
     "src/components/dialogInteractions.ts",
     "src/components/dialogStack.ts",
     "src/components/FormField.tsx",