Migrate to action-test-php

[srtfisher]

Description

I would like to see this project use https://github.com/alleyinteractive/action-test-php for CI. The existing workflows should be replaced with https://github.com/alleyinteractive/create-wordpress-plugin/blob/develop/.github/workflows/all-pr-tests.yml for consistency across the organization.

Use Case

When a developer contributes code to this project, they are tested using the proper Alley GitHub actions templates.