Merge branch '7.4' into 8.0

* 7.4:
  [FrameworkBundle] Dump all registered extensions’ configuration reference
  fix merge
  Mark FormFlow as finished if the last step is skipped
  [HttpKernel] Fix using MapRequestPayload on nullable arguments
  [ObjectMapper] bypass lazy ghost with class transform
  [WebProfilerBundle] fix displaying runner
  [DependencyInjection] Fix preloading LazyClosure
  [Emoji] Update list to version 17
  make doLoadClassMetadata() methods private
  fix routing config type information
  [HttpClient] Don't reset unused clients in data collector

Author: nicolas-grekas

Dumper/PhpDumper.php

@@ -1189,6 +1189,7 @@ private function addNewInstance(Definition $definition, string $return = '', ?st
                 || ($callable[0] instanceof Definition && !$this->definitionVariables->offsetExists($callable[0]))
             ))) {
                 $initializer = 'fn () => '.$this->dumpValue($callable[0]);
+                $this->preload[LazyClosure::class] = LazyClosure::class;
 
                 return $return.LazyClosure::getCode($initializer, $callable, $class, $this->container, $id).$tail;
             }