Add a core-convert job

Closes #3414168

package_manager/tests/src/Build/TemplateProjectTestBase.php

@@ -79,16 +79,6 @@ abstract class TemplateProjectTestBase extends QuickStartTestBase {
     ];
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getCodebaseFinder() {
-    // If core's npm dependencies are installed, we don't want them to be
-    // included in the upstream version of core that gets installed into the
-    // test site.
-    return parent::getCodebaseFinder()->notPath('#^core/node_modules#');
-  }
-
   /**
    * Sets the version of Drupal core to which the test site will be updated.
    *