fix(Dialog): add afterLeave event

[lzl0304]

Description

fixes #19660

Markup:

<template>
  <v-app>
    <v-container>
      <v-dialog v-model="showDialog" width="600" @after-leave="onAfterLeave()">
        <div class="content">Content</div>
      </v-dialog>
      <v-btn @click="reset">Reset</v-btn>
      <div>{{ hidden ? "hidden" : "visible" }}</div>
    </v-container>
  </v-app>
</template>

<script setup>
  import { ref } from 'vue'

  const showDialog = ref(true)
  const hidden = ref(false)

  function reset () {
    showDialog.value = true
    hidden.value = false
  }

  function onAfterLeave () {
    hidden.value = true
  }
</script>
<style scoped>
.content {
  width: 200px;
  height: 200px;
  background-color: #fff;
}
</style>