IBX-12374: Add PHP Behat suite configuration

[ViniTou]

🎫 Issue	IBX-12374

Description:

Part of the Behat 4 upgrade. Behat 4 removes docblock annotations (@Given/@When/@Then) and YAML configuration; the Behat 3.32 already installed accepts PHP attributes and PHP config, so this converts the bundle ahead of the ibexa/behat switch without changing behaviour. Every bundle with Behat suites gets the same treatment independently.

This bundle has no Behat contexts of its own (0 annotations), so only the suite configuration is affected: behat_suites.php is the --convert-config output of behat_suites.yml; the YAML file stays until ibexa/behat imports the PHP one, because the root config references it by filename and the two packages' versions drift within an app.

For QA:

No functional change to the scenarios; same suites run.

Documentation:

N/A

[sonarqubecloud]

Quality Gate failed

Failed conditions
21.8% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud