[Devtools] Fix DevTools hook indexing for useSyncExternalStore

[Biki-das]

When trying to use useSyncExternalStore hook , in a component and we try to profile the same, the hook count makes an additional count, say for example like in the below code, which i ran in the devtools shell test app

import * as React from 'react';
import {useState, useSyncExternalStore} from 'react';

export function Test() {
  useSyncExternalStore(
    () => {
      console.log('subscribe');
      return () => console.log('unsubscribe');
    },
    () => {
      console.log('getSnapshot');
      return 0;
    },
    () => {
      console.log('getServerSnapshot');
      return 0;
    },
  );
  const [count, setCount] = useState(0);
  return (
    <>
      <button onClick={() => setCount(count + 1)}>Count: {count}</button>
    </>
  );
}

when ran, the why did it render shows hook count as 3, which is kind of wrong, as it should be rather 2 in this case. Below are the screen recording observation on after & before the fixes

Before fixes

Screen.Recording.2025-10-11.at.11.26.17.PM.mov

After fixes

Screen.Recording.2025-10-11.at.11.29.41.PM.mov

As i went deep to search for the internal implementation for the useSyncExternalStore, which is below
https://github.com/facebook/react/blob/main/packages/react-reconciler/src/ReactFiberHooks.js#L1634, if observed closely it calls two hooks internally, so internal implementation it is fine, but for the general profiler count, it should be a single hook

[Biki-das]

cc @hoxyq looking forward to your thoughts.

[hoxyq]

Duplicate of #34547.