dillon1000/react

Move ref type check to receiver (#28464)

The runtime contains a type check to determine if a user-provided ref is
a valid type — a function or object (or a string, when
`disableStringRefs` is off). This currently happens during child
reconciliation. This changes it to happen only when the ref is passed to
the component that the ref is being attached to.

This is a continuation of the "ref as prop" change — until you actually
pass a ref to a HostComponent, class, etc, ref is a normal prop that has
no special behavior.