[11.x] Chore: Decouple Str::random() from Validator (#56852)

* add support for flushing the global state of Illuminate\Validation\Validator

* Update InteractsWithTestCaseLifecycle.php

* Update Validator.php

---------

Co-authored-by: Taylor Otwell <[email protected]>

Author: michaeldyrynda

src/Illuminate/Foundation/Testing/Concerns/InteractsWithTestCaseLifecycle.php

@@ -33,6 +33,7 @@
 use Illuminate\Support\Once;
 use Illuminate\Support\Sleep;
 use Illuminate\Support\Str;
+use Illuminate\Validation\Validator;
 use Illuminate\View\Component;
 use Mockery;
 use Mockery\Exception\InvalidCountException;
@@ -187,6 +188,7 @@ protected function tearDownTheTestEnvironment(): void
         TrustProxies::flushState();
         TrustHosts::flushState();
         ValidateCsrfToken::flushState();
+        Validator::flushState();
         WorkCommand::flushState();
 
         if ($this->callbackException) {

src/Illuminate/Validation/Validator.php

@@ -1657,6 +1657,16 @@ protected function callClassBasedExtension($callback, $parameters)
         return $this->container->make($class)->{$method}(...array_values($parameters));
     }
 
+    /**
+     * Flush the validator's global state.
+     *
+     * @return void
+     */
+    public static function flushState()
+    {
+        static::$placeholderHash = null;
+    }
+
     /**
      * Handle dynamic calls to class methods.
      *