Revert "Issue #3358384 by Spokje, mondrake: Deprecate...

Revert "Issue #3358384 by Spokje, mondrake: Deprecate \Drupal\Tests\RandomGeneratorTrait::randomStringValidate"

This reverts commit cfb55ae2.

core/tests/Drupal/Tests/RandomGeneratorTrait.php

@@ -41,15 +41,8 @@ public function randomString($length = 8) {
    *
    * @return bool
    *   TRUE if the random string is valid, FALSE if not.
-   *
-   * @deprecated in drupal:10.2.0 and is removed from drupal:11.0.0.
-   *   Use \Drupal\TestTools\Random::stringValidate() instead.
-   *
-   * @see https://www.drupal.org/node/3358389
    */
   public function randomStringValidate($string) {
-    @trigger_error(__METHOD__ . "() is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Use \Drupal\TestTools\Random::stringValidate() instead. See https://www.drupal.org/node/3358389", E_USER_DEPRECATED);
-
     return Random::stringValidate($string);
   }