EE Port - 63560 add vue i18n eslint EE

What does this MR do?

Adds eslint-plugin-vue-i18n to provide i18n linting for .vue files.

• This MR should be merged after https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14932
• Files with eslint-disable directives will have their outstanding lints addressed in https://gitlab.com/gitlab-org/gitlab-ce/issues/63458, at which point the eslint-disables can be removed.

New Rules

• Introduces 2 new rules
  • no-bare-strings: providing an error on bare strings

<template>
<div>
 <h1>This is a translatable string</h1> // Error: Content should be marked for translation
</div>
</template>

• no-bare-attribute-strings: providing an error on bare attributes

<template>
<div>
 <h1 title="This is translatable">{{ __('This is a translatable string') }}</h1> // Error: Attribute should be marked for translation
</div>
</template>

• Provides autofixing for simple offences
• Disables the rules for files that will need to be manually fixed

CE MR

CE MR