Add lint:yaml and update the package.json for Varbase Layout Builder module with latest Drupal 9.3.x dev tools

Problem/Motivation

Standard check and linting tools are outdated.
And a new linting tool with yarn lint:yaml was added to Drupal core
#2591827: Add YAML linting to core coding standards checks

Very important to make sure that all .yml files are in the right format.
eslint-plugin-yml a good tool to lint with
Example: using not standard format
or check on any duplicate yaml elements

Proposed resolution

Add the yarn lint:yaml
and update all outdated check configs and the package.json file

Compiling Provided Component Styles

In case of wanting to add a new feature or fix a bug in styling for a selected Varbase component.

Get Needed Yarn Development Dependencies
yarn install

---

Initialize
Initialize the gulp SASS files styling method. Run this only ones for each newly cloned project.
yarn theme:init

---

Theme Build
Compile source .scss files to .css files. Needs to compile manually on demand.
yarn theme:build

---

Watch
Watch source .scss files and compile them on saving to .css files. Auto compiling on save of changes for the source.
yarn theme:watch

After any change of code please check the standards before uploading a patch or creating a MR.

Check Standards/Practice Coding And Linting

Check Drupal Standard And Practice Coding
Check Drupal standard and practice coding.
yarn phpcs

---

PHP Code Beautifier and Fixer
Fix many errors and warnings automatically.
yarn phpcbf

---

Linting YAML files
Check all .yml files with Drupal standard yaml format.
yarn lint:yaml

---

Linting JavaScript files
Check all JavaScript .js, .json files with Drupal standard scripting format.
yarn lint:js

---

Linting Styling
Check all styling .css files with Drupal standard styling format and order.
yarn lint:css

  "scripts": {
    "theme:init": "gulp",
    "theme:build": "gulp compile",
    "theme:watch": "gulp watch",
    "phpcs": "phpcs --standard=./.phpcs.xml .",
    "phpcbf": "phpcbf --standard=./.phpcs.xml .",
    "lint:yaml": "node ./node_modules/eslint/bin/eslint.js --config=.eslintrc.json --ext .yml .",
    "lint:js": "node ./node_modules/eslint/bin/eslint.js --config=.eslintrc.json .",
    "lint:css": "npx stylelint --config=.stylelintrc.json ."
  },

Remaining tasks

• ✅ File an issue about this project
• ✅ Add lint:yaml and update packages in package.json
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ✅ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Release varbase-9.0.2, varbase_layout_builder-10.0.4

User interface changes

• None

API changes

• None

Data model changes

• None