Merge branch '3.4' into 4.4

* 3.4:
  Skip Doctrine DBAL on php 8 until we have a compatible version.
  [DomCrawler] Catch expected ValueError.
  [Validator] Catch expected ValueError.
  [VarDumper] ReflectionFunction::isDisabled() is deprecated.
  [PropertyAccess] Parse php 8 TypeErrors correctly.
  [Intl] Fix call to ReflectionProperty::getValue() for static properties.
  [HttpKernel] Prevent calling method_exists() with non-string values.
  [Debug] php 8 does not pass $context to error handlers.
  [Config] Removed implicit cast of ReflectionProperty to string.
  [Debug] Undefined variables raise a warning in php 8.
  [Debug] Skip test that would trigger a fatal error on php 8.
  Address deprecation of ReflectionType::getClass().
  Properties $originalName and $mimeType are never null in UploadedFile

File/UploadedFile.php

@@ -31,7 +31,7 @@
  */
 class UploadedFile extends File
 {
-    private $test = false;
+    private $test;
     private $originalName;
     private $mimeType;
     private $error;
@@ -83,7 +83,7 @@ public function __construct(string $path, string $originalName, string $mimeType
      * It is extracted from the request from which the file has been uploaded.
      * Then it should not be considered as a safe value.
      *
-     * @return string|null The original name
+     * @return string The original name
      */
     public function getClientOriginalName()
     {
@@ -112,7 +112,7 @@ public function getClientOriginalExtension()
      * For a trusted mime type, use getMimeType() instead (which guesses the mime
      * type based on the file content).
      *
-     * @return string|null The mime type
+     * @return string The mime type
      *
      * @see getMimeType()
      */