dev: upgrade phpcs and solve some errors

[Soare-Robert-Daniel]

Summary

Important

With the upgraded PHPCS, there are lots of warnings reported.

• Updated the PHPCS
• Fixed some new errors reported
• Made the GitHub Action to check only the errors since there are lots of warnings

Will affect the visual aspect of the product

NO

Screenshots

Test instructions

• Check if everything is fine

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #.

[pirate-bot]

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[HardeepAsrani]

Only reviewed the PHPCS changed and not each individual change here, we can also see why the e2e is failing after the changes.