minor #54317 Clean PhpCsFixer configuration (smnandre)

This PR was squashed before being merged into the 7.1 branch.

Discussion
----------

Clean PhpCsFixer configuration

| Q             | A
| ------------- | ---
| Branch?       | 7.1
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Issues        | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

Remove some lines from the configuration
* Framework files that do not exist anymore (Templating & Form paths)
* Files ignored by the "Fixtures" rules

Commits
-------

99ae653 Clean PhpCsFixer configuration

.php-cs-fixer.dist.php

@@ -40,11 +40,6 @@
             ->append([__FILE__])
             ->notPath('#/Fixtures/#')
             ->exclude([
-                // directories containing files with content that is autogenerated by `var_export`, which breaks CS in output code
-                // fixture templates
-                'Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/Resources/Custom',
-                // resource templates
-                'Symfony/Bundle/FrameworkBundle/Resources/views/Form',
                 // explicit trigger_error tests
                 'Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/',
                 'Symfony/Component/Emoji/Resources/',
@@ -57,12 +52,6 @@
             ->notPath('Symfony/Bridge/PhpUnit/SymfonyTestsListener.php')
             ->notPath('#Symfony/Bridge/PhpUnit/.*Mock\.php#')
             ->notPath('#Symfony/Bridge/PhpUnit/.*Legacy#')
-            // file content autogenerated by `var_export`
-            ->notPath('Symfony/Component/Translation/Tests/Fixtures/resources.php')
-            // file content autogenerated by `VarExporter::export`
-            ->notPath('Symfony/Component/Serializer/Tests/Fixtures/serializer.class.metadata.php')
-            // test template
-            ->notPath('Symfony/Bundle/FrameworkBundle/Tests/Templating/Helper/Resources/Custom/_name_entry_label.html.php')
             // explicit trigger_error tests
             ->notPath('Symfony/Component/ErrorHandler/Tests/DebugClassLoaderTest.php')
             // stop removing spaces on the end of the line in strings