[Tests] Silenced all deprecations in tests for 2.3
[Security] Delete old session on auth strategy migrate
bug #13048 [Security] Delete old session on auth strategy migrate (xelaris)

This PR was merged into the 2.3 branch.

Discussion
----------

[Security] Delete old session on auth strategy migrate

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #13026
| License       | MIT
| Doc PR        |

As identified by @austinh in #13026 there are two sessions after authentication, since the previous session is migrated to a new one by ``session_regenerate_id``. This PR ensures the old session is been deleted immediately on migration.
I can't see any drawbacks, but if the change would break BC, another approach would be to add a new strategy like ``switch`` to enable instant deletion of the old session.

Commits
-------

5dd11e6 [Security] Delete old session on auth strategy migrate
Merge branch '2.3' into 2.5

* 2.3:
  [Config] adds missing « use » statement for InvalidTypeException type hint in documentation.
  [Config] fixes broken unit test on ArrayNode class.
  fixed CS
  [Security] Delete old session on auth strategy migrate
  update required minimum TwigBridge version
  Very minor grammar fix in error message
  [Tests] Silenced all deprecations in tests for 2.3
  BinaryFileResponse - add missing newline
  fixed CS
  add a limit and a test to FlattenExceptionTest.
  CS: There should be no empty lines following phpdocs
  [FrameworkBundle] fix cache:clear command
  [2.3] Docblocks should not be followed by a blank line
  Fix return phpdoc
  [PropertyAccess] Added test to verify #5775 is fixed

Conflicts:
	src/Symfony/Bundle/TwigBundle/composer.json
	src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
	src/Symfony/Component/Security/Core/Tests/Validator/Constraints/UserPasswordValidatorTest.php
Merge branch '2.5' into 2.6

* 2.5:
  [Config] adds missing « use » statement for InvalidTypeException type hint in documentation.
  [Config] fixes broken unit test on ArrayNode class.
  fixed CS
  [Security] Delete old session on auth strategy migrate
  update required minimum TwigBridge version
  Very minor grammar fix in error message
  [Tests] Silenced all deprecations in tests for 2.3
  BinaryFileResponse - add missing newline
  fixed CS
  add a limit and a test to FlattenExceptionTest.
  CS: There should be no empty lines following phpdocs
  [FrameworkBundle] fix cache:clear command
  [2.3] Docblocks should not be followed by a blank line
  Fix return phpdoc
  [PropertyAccess] Added test to verify #5775 is fixed
Merge branch '2.6' into 2.7

* 2.6: (23 commits)
  [Config] adds missing « use » statement for InvalidTypeException type hint in documentation.
  [Config] fixes broken unit test on ArrayNode class.
  fixed CS
  [Security] Delete old session on auth strategy migrate
  skip if param "translator.logging" doesn't exist.
  update required minimum TwigBridge version
  Very minor grammar fix in error message
  Added the function providers as container resources
  [Tests] Silenced all deprecations in tests for 2.3
  BinaryFileResponse - add missing newline
  fixed CS
  add a limit and a test to FlattenExceptionTest.
  [DebugBundle] enable the DumpDataCollectorPass
  [FrameworkBundle] Use debug namespace.
  [FrameworkBundle] update debug commands references
  skip compiler pass if interface doesn't exist
  Unify the way to provide expression functions for the DI container
  CS: There should be no empty lines following phpdocs
  fix link format handling with disabled templating
  [FrameworkBundle] fix cache:clear command
  ...

Conflicts:
	src/Symfony/Bridge/Doctrine/phpunit.xml.dist
	src/Symfony/Bridge/Monolog/phpunit.xml.dist
	src/Symfony/Bridge/Propel1/phpunit.xml.dist
	src/Symfony/Bridge/ProxyManager/phpunit.xml.dist
	src/Symfony/Bridge/Twig/phpunit.xml.dist
	src/Symfony/Bundle/FrameworkBundle/phpunit.xml.dist
	src/Symfony/Bundle/SecurityBundle/phpunit.xml.dist
	src/Symfony/Bundle/TwigBundle/phpunit.xml.dist
	src/Symfony/Bundle/WebProfilerBundle/phpunit.xml.dist
	src/Symfony/Component/BrowserKit/phpunit.xml.dist
	src/Symfony/Component/ClassLoader/phpunit.xml.dist
	src/Symfony/Component/Config/phpunit.xml.dist
	src/Symfony/Component/Console/phpunit.xml.dist
	src/Symfony/Component/CssSelector/phpunit.xml.dist
	src/Symfony/Component/Debug/phpunit.xml.dist
	src/Symfony/Component/DependencyInjection/phpunit.xml.dist
	src/Symfony/Component/DomCrawler/phpunit.xml.dist
	src/Symfony/Component/EventDispatcher/phpunit.xml.dist
	src/Symfony/Component/Filesystem/phpunit.xml.dist
	src/Symfony/Component/Finder/phpunit.xml.dist
	src/Symfony/Component/Form/phpunit.xml.dist
	src/Symfony/Component/HttpFoundation/phpunit.xml.dist
	src/Symfony/Component/HttpKernel/phpunit.xml.dist
	src/Symfony/Component/Intl/phpunit.xml.dist
	src/Symfony/Component/Locale/phpunit.xml.dist
	src/Symfony/Component/OptionsResolver/phpunit.xml.dist
	src/Symfony/Component/Process/phpunit.xml.dist
	src/Symfony/Component/PropertyAccess/phpunit.xml.dist
	src/Symfony/Component/Routing/phpunit.xml.dist
	src/Symfony/Component/Security/phpunit.xml.dist
	src/Symfony/Component/Serializer/phpunit.xml.dist
	src/Symfony/Component/Stopwatch/phpunit.xml.dist
	src/Symfony/Component/Templating/phpunit.xml.dist
	src/Symfony/Component/Translation/phpunit.xml.dist
	src/Symfony/Component/Validator/phpunit.xml.dist
	src/Symfony/Component/Yaml/phpunit.xml.dist