Animate call link join requests

ts/components/CallingPendingParticipants.stories.tsx

@@ -60,6 +60,26 @@ export function Many(): JSX.Element {
   );
 }
 
+export function Changing(): JSX.Element {
+  const counts = [0, 1, 2, 3, 2, 1];
+  const [countIndex, setCountIndex] = React.useState<number>(0);
+  React.useEffect(() => {
+    const interval = setInterval(() => {
+      setCountIndex((countIndex + 1) % counts.length);
+    }, 1000);
+
+    return () => clearInterval(interval);
+  }, [countIndex, counts.length]);
+
+  return (
+    <CallingPendingParticipants
+      {...createProps({
+        participants: allRemoteParticipants.slice(0, counts[countIndex]),
+      })}
+    />
+  );
+}
+
 export function ExpandedOne(): JSX.Element {
   return (
     <CallingPendingParticipants