TECH-111: CI/CD and Linting Updates

[efuller]

Summary

The goal here was to help refine GH actions as well as achieve fewer PHPCS and PHPStan errors out of the box when scaffolding a new project. There's no doubt there will be more fixes needed.

PR Details

• Sets Node versions to 20
• Sets PHP versions to 8.2
• Improves PHPStan compliance out of the box
• Improves PHPCS compliance out of the box

Notes

• There were some corresponding fixes added to a PR over in Create WordPress Theme - https://github.com/alleyinteractive/create-wordpress-theme/pull/30
• There were additional tickets created:

  • 95

  • 96

  • 97

Ticket

https://l.alley.dev/08d4bfa65c