Draft: Revert "Issue #3445896 by mstrelan, mondrake:...

Revert "Issue #3445896 by mstrelan, mondrake: PHPUnit\Runner\ErrorHandler::__construct is private since PHPUnit 11.1"

This reverts commit 3232e588.

Closes #3446164

core/tests/bootstrap.php

@@ -171,7 +171,7 @@ class_alias('\Drupal\Tests\DocumentElement', '\Behat\Mink\Element\DocumentElemen
   // DebugClassLoader, that occur before tests' setUp() methods are called.
   // We pass an instance of the PHPUnit error handler to redirect any error not
   // managed by our layer back to PHPUnit.
-  set_error_handler(new BootstrapErrorHandler(PhpUnitErrorHandler::instance()));
+  set_error_handler(new BootstrapErrorHandler(new PhpUnitErrorHandler()));
 
   // Enable the DebugClassLoader to get deprecations for methods' signature
   // changes.