Add jump to date functionality to date headers in timeline v2 (#7339)

Fix https://github.com/vector-im/element-web/issues/7677

Utilizes MSC3030: https://github.com/matrix-org/matrix-doc/pull/3030

https://user-images.githubusercontent.com/558581/150060664-79627573-f4fd-497c-b726-dc3485854bd0.png

src/utils/exportUtils/HtmlExport.tsx

@@ -248,7 +248,11 @@ export default class HTMLExporter extends Exporter {
 
     protected getDateSeparator(event: MatrixEvent) {
         const ts = event.getTs();
-        const dateSeparator = <li key={ts}><DateSeparator forExport={true} key={ts} ts={ts} /></li>;
+        const dateSeparator = (
+            <li key={ts}>
+                <DateSeparator forExport={true} key={ts} roomId={event.getRoomId()} ts={ts} />
+            </li>
+        );
         return renderToStaticMarkup(dateSeparator);
     }