Use new UI (#8983)

* fixup build

* swap frontends

web-old/__test__/testing-library.js

@@ -0,0 +1,24 @@
+import { h } from 'preact';
+import { render } from '@testing-library/preact';
+import { ApiProvider } from '../src/api';
+
+const Wrapper = ({ children }) => {
+  return (
+    <ApiProvider
+      options={{
+        dedupingInterval: 0,
+        provider: () => new Map(),
+      }}
+    >
+      {children}
+    </ApiProvider>
+  );
+};
+
+const customRender = (ui, options) => render(ui, { wrapper: Wrapper, ...options });
+
+// re-export everything
+export * from '@testing-library/preact';
+
+// override render method
+export { customRender as render };