Fix Side Nav URL behavior with NewHomePage enabled (#312) (#315)

Signed-off-by: saimedhi <saimedhi@amazon.com>
(cherry picked from commit c8faaf7)

Co-authored-by: Sai Medhini Reddy Maryada <117196660+saimedhi@users.noreply.github.com>

public/render_app.tsx

@@ -38,5 +38,20 @@ export const renderApp = (
     params.element
   );
 
-  return () => ReactDOM.unmountComponentAtNode(params.element);
+  const expectedBasePath = '/app/flow-framework#';
+
+  const unlistenParentHistory = params.history.listen(() => {
+    if (
+      hideInAppSideNavBar &&
+      window.location.pathname.endsWith('/app/flow-framework')
+    ) {
+      window.location.href = `${expectedBasePath}`;
+      window.dispatchEvent(new HashChangeEvent('hashchange'));
+    }
+  });
+
+  return () => {
+    ReactDOM.unmountComponentAtNode(params.element);
+    unlistenParentHistory();
+  };
 };