[3.0] Introduce Auto review test suite

[live627]

Summary

Introduce an auto-review PHPUnit test suite and run it in CI.

This is inspired by the auto-review test suite in PHP-CS-Fixer, which has been valuable for providing immediate feedback on pull requests and guidance on things that need to be changed before review.

The goal is to build a similar set of automated checks for SMF that can catch project-specific issues that existing tools such as PHPUnit, PHP-CS-Fixer, and Composer validation do not cover.

Changes

• Add an auto-review PHPUnit testsuite for tests/AutoReview.

• Run the auto-review suite as part of the PHP GitHub Actions workflow.

• Add ComposerFileTest to check that:

  • Custom Composer scripts have descriptions.
  • There are no descriptions for undefined scripts.
  • Composer lifecycle event scripts are not incorrectly required to have descriptions.
  • The configured config.platform.php version satisfies the declared PHP requirement.

• Add the standard tests/AutoReview/index.php entry point.

Motivation

The intention is not to duplicate checks already performed by existing tooling. Instead, the auto-review suite should provide fast, actionable feedback for project-specific conventions and relationships that are difficult or impossible for those tools to validate.

For example, a Composer configuration can be syntactically valid and pass Composer's own validation while still containing a project-specific inconsistency that we want to catch automatically.

This suite can be expanded over time as additional review patterns are identified.

Future direction

Eventually, the auto-review suite should cover a broader range of SMF-specific checks that other automated tools do not catch, providing contributors with immediate feedback and guidance during pull requests rather than discovering these issues later during manual review.