Add yarn script commands for Drupal coding standard and Drupal Practice for Varbase Landing Page (Paragraphs)

Problem/Motivation

Saving time on checking standards and practice before committing any code.

#3113176: Drupal 9 compatibility for [Varbase Landing] with Drupal coding standard and practice

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Drupal coding standard and Drupal Practice check should pass

PHPCS, PHPCBF for both --standard=Drupal and --standard=DrupalPractice

Check Varbase Landing Drupal coding standard

phpcbf --standard=Drupal --extensions=php,module,inc,install,test,theme,scss,css,info,txt,md,yml /var/www/html/products/varbase_landing/

phpcs --standard=Drupal --extensions=php,module,inc,install,test,theme,scss,css,info,txt,md,yml /var/www/html/products/varbase_landing/

Check Varbase Landing Drupal Practice

phpcbf --standard=DrupalPractice --extensions=php,module,inc,install,test,theme,scss,css,info,txt,md,yml /var/www/html/products/varbase_landing/

phpcs --standard=DrupalPractice --extensions=php,module,inc,install,test,theme,scss,css,info,txt,md,yml /var/www/html/products/varbase_landing/

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Proposed resolution

yarn phpcs
yarn phpcbf

as

  "scripts": {
    "phpcs": "phpcs --standard=./.phpcs.xml .",
    "phpcbf": "phpcbf --standard=./.phpcs.xml ."
  },