[HttpKernel] Remove unused method Kernel::isClassInActiveBundle

Follow-up of #11869
[WebProfilerBundle] Fixed IE8 support
[PropertyAccess] Added test to verify #5775 is fixed
[Hackday] [2.7] Add a deprecation note about TypeTestCase
[HttpKernel] Added deprecated error to init()
[HttpKernel] fix deprecation notice for Kernel::init()
Add a deprecation note about CsrfProviderInterface
Add a deprecation note about VirtualFormAwareIterator
Fix deprecation notice on VirtualFormAwareIterator
[Form] Log deprecation of constants, fixes #12607 #12667
Fix return phpdoc
[2.3] Docblocks should not be followed by a blank line
minor #12993 [2.3] Docblocks should not be followed by a blank line (GrahamCampbell)

This PR was squashed before being merged into the 2.3 branch (closes #12993).

Discussion
----------

[2.3] Docblocks should not be followed by a blank line

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

There should be no blank line(s) between phpdocs that document properties, interfaces, classes, functions, or traits. This pull request was a test run of a new php-cs-fixer: https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/864.

Commits
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4e7ba1b [2.3] Docblocks should not be followed by a blank line
minor #12985 [HttpFoundation] Fix return phpdoc (Koc)

This PR was merged into the 2.3 branch.

Discussion
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[HttpFoundation] Fix return phpdoc

| Q             | A
| ------------- | ---
| Bug fix?      | tiny (for IDE autocompletion)
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

What about using `self` or `static` keyword for this?

Commits
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9af2d81 Fix return phpdoc
[FrameworkBundle] fix cache:clear command
fix link format handling with disabled templating
[Security] Added the triggering of the security.interactive_login event after set of token
CS: There should be no empty lines following phpdocs
bug #13009 [DebugBundle] fix link format handling with disabled templating (xabbuh)

This PR was merged into the 2.6 branch.

Discussion
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[DebugBundle] fix link format handling with disabled templating

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #13007
| License       | MIT
| Doc PR        |

Commits
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91b4d1d fix link format handling with disabled templating
minor #13011 CS: There should be no empty lines following phpdocs (keradus)

This PR was merged into the 2.3 branch.

Discussion
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CS: There should be no empty lines following phpdocs

Commits
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143f900 CS: There should be no empty lines following phpdocs