refactor: remove unused inheritRef option

This is technically a breaking change, but the option was not meant for public use
and ended up not solving the problem it was introduced for.

packages/runtime-core/src/componentRenderUtils.ts

@@ -180,10 +180,6 @@ export function renderComponentRoot(
       }
       root.transition = vnode.transition
     }
-    // inherit ref
-    if (Component.inheritRef && vnode.ref != null) {
-      root.ref = vnode.ref
-    }
 
     if (__DEV__ && setRoot) {
       setRoot(root)