Follow WP Coding Standards

[dkotter]

Description of the Change

Up to this point we've been using the 10up-Default coding standards, which utilizes the WP Coding Standards but also adds it's own rules on top. We recently started to migrate our plugins to just using the WP Coding Standards as that seems like a better standard to follow so this PR does that for ClassifAI.

This removes the use of 10up/phpcs-composer and replaces that with automattic/vipwpcs and wp-coding-standards/wpcs. We also update our PHPCS config to ensure we're utilizing this.

I then ran the PHPCS autofixer to fix all easy issues (like using array instead of []) and then I manually went through and addressed all remaining errors and warnings, either directly fixing those if needed or adding ignore statements for things that didn't need fixed.

How to test the Change

Ensure all checks pass on this PR, most importantly the PHPCS one. If desired, do a general smoke testing of the plugin.

Changelog Entry

Developer - Switch to directly using the WordPress Coding Standards and fix all errors and warnings that was flagging

Credits

Props @dkotter

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.