refactor(admin): remove unused editor event hook

apps/admin/src/common/wangeditor-customer/core/useEditorFeatureEvents.js

-import { useEffect, useRef } from 'react'
-
-export const useEditorFeatureEvents = ({ editor, registry, runtime }) => {
-  const runtimeRef = useRef(runtime)
-  runtimeRef.current = runtime
-
-  useEffect(() => {
-    if (!editor) return
-
-    const listeners = registry.events.map(({ name, handler }) => ({
-      name,
-      listener: payload => handler({ editor, payload, runtime: runtimeRef.current }),
-    }))
-    listeners.forEach(({ name, listener }) => editor.on(name, listener))
-
-    return () => listeners.forEach(({ name, listener }) => editor.off(name, listener))
-  }, [editor, registry])
-}