Revert "Make the PHP test runner conifigurable"

This reverts commit 5f62b02d14.

resources/build.defaults.yaml

@@ -1,9 +1,6 @@
 drupal:
   docroot: web
 
-php:
-  test_runner: phpunit
-
 experimental:
   runStaticAnalysisOnTests: false
 

src/DataTransferObject/ConfigDto.php

@@ -239,10 +239,6 @@ final class ConfigDto
             'phpunit' => new Assert\Optional(
                 new Assert\IsFalse(),
             ),
-
-            'test_runner' => new Assert\Optional(
-                new Assert\Choice(['phpunit', 'pest', 'paratest']),
-            ),
         ],
     )]
     public array $php;

templates/php/drupal/run.twig

@@ -111,9 +111,9 @@ function stop {
   docker compose down
 }
 
-{% if not php.phpunit is same as false and not php.test_runner is same as false %}
+{% if not php.phpunit is same as false %}
 function test {
-  _exec php {{ php.test_runner }} --colors=always "${@}"
+  _exec php phpunit --colors=always "${@}"
 }
 {% endif %}