ref: use composer to get installed modules

[Litarnus]

Retrieves package versions directly from composer, which supports getting pretty versions without needing an extra package. Closes #1897

[seer-by-sentry]

Potential bug: The code directly uses the Composer\InstalledVersions class without a fallback, causing a fatal "Class not found" error on systems running Composer 1.x.

• Description: The code was updated to use Composer\InstalledVersions, a class only available in Composer 2.0 and later. However, the previous implementation contained explicit fallback logic to support Composer 1.x, which has now been removed. The project's composer.json does not enforce a Composer 2.0 requirement by including "composer-runtime-api": "^2.0". Consequently, on systems still using Composer 1.x, any call to ModulesIntegration::getComposerPackages() will result in a fatal "Class 'Composer\InstalledVersions' not found" error, causing the application to crash during Sentry event processing.

• Suggested fix: To restore backward compatibility, reintroduce a check like class_exists(InstalledVersions::class) before using the class and provide a fallback for older environments. Alternatively, if dropping Composer 1.x support is intended, add "composer-runtime-api": "^2.0" to the require section of composer.json to prevent installation on incompatible systems.
  _{severity: 0.85, confidence: 0.98}

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[cleptric]

Need to revert these changes