Use getPathname() instead of string casting to get BinaryFileReponse file path
[HttpFoundation] fixed some volatile tests
minor #11966 [HttpFoundation] fixed some volatile tests (fabpot)

This PR was merged into the 2.3 branch.

Discussion
----------

[HttpFoundation] fixed some volatile tests

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | see #11588
| License       | MIT
| Doc PR        | n/a

Commits
-------

00c1b75 [Process] fixed some volatile tests
974bf01 [HttpKernel] fixed a volatile test
6020c43 [HttpFoundation] fixed some volatile tests
fixed CS
Merge branch '2.3' into 2.4

* 2.3:
  fixed CS
  [Process] fixed some volatile tests
  [HttpKernel] fixed a volatile test
  [HttpFoundation] fixed some volatile tests
  Use getPathname() instead of string casting to get BinaryFileReponse file path

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
	src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
	src/Symfony/Bundle/FrameworkBundle/EventListener/SessionListener.php
	src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
	src/Symfony/Component/ClassLoader/Tests/ApcUniversalClassLoaderTest.php
	src/Symfony/Component/Config/Definition/ReferenceDumper.php
	src/Symfony/Component/Config/Tests/Definition/Dumper/YamlReferenceDumperTest.php
	src/Symfony/Component/Console/Application.php
	src/Symfony/Component/Console/Tests/ApplicationTest.php
	src/Symfony/Component/Filesystem/Exception/IOException.php
	src/Symfony/Component/Form/Extension/Templating/TemplatingExtension.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
	src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
	src/Symfony/Component/HttpKernel/Tests/Bundle/BundleTest.php
	src/Symfony/Component/HttpKernel/Tests/Fragment/RoutableFragmentRendererTest.php
	src/Symfony/Component/HttpKernel/Tests/Profiler/Mock/RedisMock.php
	src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
	src/Symfony/Component/PropertyAccess/PropertyAccessor.php
	src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCollectionTest.php
	src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
	src/Symfony/Component/Routing/Matcher/Dumper/ApacheMatcherDumper.php
	src/Symfony/Component/Routing/Tests/Annotation/RouteTest.php
	src/Symfony/Component/Routing/Tests/Loader/AnnotationClassLoaderTest.php
	src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
	src/Symfony/Component/Validator/Constraints/CollectionValidator.php
	src/Symfony/Component/Validator/Tests/ExecutionContextTest.php