fix(VAutocomplete): fix screenreader navigation

[Martin-Idel]

Screen readers need the options role in order to successfully redirect arrow navigation to the options. Without this change, keyboard navigation is broken when having a screen reader on.

fixes #18858

Description

This is the same fix as #18629 but now for VAutocomplete instead of VSelect.
You need to have a screen reader running to test these changes, as the screen reader changes keyboard navigation!

Tested with Orca and JAWS.

Markup:

<template>
  <v-app>
    <v-container>
      <v-autocomplete :items="items" label="Select an Item" />
    </v-container>
  </v-app>
</template>

<script>
  export default {
    name: 'Playground',
    setup () {
      return {
        //
      }
    },
    data: () => ({
      items: ['Apple', 'Orange', 'Pineapple']
    })
  }
</script>

[johnleider]

Would this apply to VSelect or VCombobox?

[Martin-Idel]

#18629 did the exact same for VSelect, so it applies but is already done.

I missed VCombobox. I checked and yes this should also have it. I updated the PR with a second commit for this.