ci: migrate to wp-env

[justlevine]

What

Rescaffolds root dev commands, moves over to wp-env, and bumps support to php8.4 + wp6.9

Why

How

Testing Instructions

Additional Info

Checklist:

• This PR is tested to the best of my abilities.
• This PR follows the WordPress Coding Standards.
• This PR has proper inline documentation.
• This PR has unit tests to verify the code works as intended.
• The changes in this PR have been noted in CHANGELOG.md

[Copilot]

Pull request overview

This PR migrates the testing infrastructure from a custom Docker setup to WordPress's official wp-env tool. The changes streamline the development and testing workflow by leveraging WordPress's standardized environment management, replacing custom Docker configurations with @wordpress/env.

Changes:

• Migrated from custom Docker containers to wp-env for test environment management
• Updated test mocks to support wp-env's file system constraints
• Added compatibility layer for AppContext to support multiple WPGraphQL versions
• Consolidated CI/CD workflows into a single comprehensive test workflow

Reviewed changes

Copilot reviewed 61 out of 73 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.wp-env.json	New wp-env configuration for WordPress environment setup
package.json	Added npm dependencies and scripts for wp-env management
tests/_data/mu-plugins/test-url-fixer.php	URL rewriting logic for wp-env Docker environment
bin/after-start.sh	Post-start setup script for wp-env lifecycle
codeception.dist.yml	Updated Codeception config for wp-env module paths
tests/wpunit/*.php	Added mock classes to handle file uploads in wp-env
src/Utils/Compat.php	New compatibility layer for AppContext getter/setter methods
src/**/*.php	Updated to use Compat layer instead of direct AppContext property access
.github/workflows/test.yml	New consolidated CI workflow using wp-env
composer.json	Updated dependencies to wp-browser 3.7+

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[Copilot]

Pull request overview

Copilot reviewed 38 out of 50 changed files in this pull request and generated no new comments.

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