Revert "Issue #2935157 by neclimdul, alexpott: Run-test.sh does not run TestSuite tests"

This reverts commit a4019731e3.

core/tests/Drupal/Tests/TestSuites/TestSuiteBaseTest.php

@@ -1,14 +1,13 @@
 <?php
 
-namespace Drupal\Tests\Core\Test;
+namespace Drupal\Tests\TestSuites;
 
-use Drupal\Tests\TestSuites\TestSuiteBase;
 use org\bovigo\vfs\vfsStream;
 use PHPUnit\Framework\TestCase;
 
 // The test suite class is not part of the autoloader, we need to include it
 // manually.
-require_once __DIR__ . '/../../../../TestSuites/TestSuiteBase.php';
+require_once __DIR__ . '/../../../TestSuites/TestSuiteBase.php';
 
 /**
  * @coversDefaultClass \Drupal\Tests\TestSuites\TestSuiteBase