fix(VStepperStep): editable step tab navigation

[lentyaevpk]

Description

Added tab navigation for editable stepper steps.
Fixes #14022

How Has This Been Tested?

Visually

Markup:

// Paste your FULL Playground.vue here
<template>
  <v-stepper>
    <v-stepper-header>
      <v-stepper-step
        editable
        step="1"
      >
        Select campaign settings
      </v-stepper-step>

      <v-divider></v-divider>

      <v-stepper-step
        editable
        step="2"
      >
        Create an ad group
      </v-stepper-step>

      <v-divider></v-divider>

      <v-stepper-step
        step="3"
        editable
      >
        Create an ad
      </v-stepper-step>
    </v-stepper-header>
  </v-stepper>
</template>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and backwards compatible changes and next for non-backwards compatible changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)