fix(VAutocomplete/VCombobox): remove tab key listener

[yuwu9145]

For autocomplete/comobobox, "Tab" key is equivalent to "blur", so remove tab key listener and let isFocused === false watcher handle "auto-select-first"

fixes #19840

Description

Markup:

<template>
  <v-app>
    <v-container>
      <v-combobox
        chips
        label="Combobox"
        :items="['California1', 'California2', 'California3', 'Colorado', 'Florida', 'Georgia', 'Texas', 'Wyoming']"
        multiple
        hide-selected
        auto-select-first
      />
      <v-autocomplete
        chips
        label="Autocomplete"
        :items="['California1', 'California2', 'California3', 'Colorado', 'Florida', 'Georgia', 'Texas', 'Wyoming']"
        multiple
        hide-selected
        auto-select-first
      />
    </v-container>
  </v-app>
  <!-- 
  1. Type Cal
  2. Hit tab
  3. Notice California1 and California2 are populated to input field.
  4. Behavior does not occur if you type Cal, arrow down to California2 and tab.

  Appears to have broken in 3.3.11 release. Was working in 3.3.10
        -->
</template>