dillon1000/react

Add ref cleanup function (#25686)

Add option for ref function to return a clean up function.

```jsx
<div ref={(_ref) => {
  // Use `_ref`
  return () => {
    // Clean up _ref
  };
}} />
```

If clean up function is not provided. Ref function is called with null
like it has been before.

```jsx
<div ref={(_ref) => {
  if (_ref) {
    // Use _ref
  } else {
    // Clean up _ref
  }
}} />
```