minor #57901 Code style change in `@PER-CS2.0 affecting @Symfony` (parentheses for anonymous classes) (bonroyage)

This PR was squashed before being merged into the 7.2 branch.

Discussion
----------

Code style change in ``@PER`-CS2.0` affecting ``@Symfony`` (parentheses for anonymous classes)

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

I have created a PR (PHP-CS-Fixer/PHP-CS-Fixer#8140) in the PHP-CS-Fixer repo to bring the ``@PER`-CS2.0` ruleset in line with the specifications on the `new_with_parentheses` rule for anonymous classes. Since the ``@Symfony`` ruleset builds upon the ``@PER`-CS2.0` ruleset, they would like confirmation that the Symfony community is OK with this change affecting the Symfony ruleset as well. Should it not be, I'll push another commit there ensuring that the change does not affect ``@Symfony``.

Therefore, this PR is not meant to be merged, but function as an RFC to get your opinion and show the effect it would have when applied to the Symfony source.

Commits
-------

506e0dd327 Code style change in ``@PER`-CS2.0` affecting ``@Symfony`` (parentheses for anonymous classes)

Author: derrabus

Tests/InputBagTest.php

@@ -20,7 +20,7 @@ class InputBagTest extends TestCase
 {
     public function testGet()
     {
-        $bag = new InputBag(['foo' => 'bar', 'null' => null, 'int' => 1, 'float' => 1.0, 'bool' => false, 'stringable' => new class() implements \Stringable {
+        $bag = new InputBag(['foo' => 'bar', 'null' => null, 'int' => 1, 'float' => 1.0, 'bool' => false, 'stringable' => new class implements \Stringable {
             public function __toString(): string
             {
                 return 'strval';
@@ -58,7 +58,7 @@ public function testGetBooleanError()
 
     public function testGetString()
     {
-        $bag = new InputBag(['integer' => 123, 'bool_true' => true, 'bool_false' => false, 'string' => 'abc', 'stringable' => new class() implements \Stringable {
+        $bag = new InputBag(['integer' => 123, 'bool_true' => true, 'bool_false' => false, 'string' => 'abc', 'stringable' => new class implements \Stringable {
             public function __toString(): string
             {
                 return 'strval';

Tests/JsonResponseTest.php

@@ -171,7 +171,7 @@ public function testConstructorWithNullAsDataThrowsAnUnexpectedValueException()
 
     public function testConstructorWithObjectWithToStringMethod()
     {
-        $class = new class() {
+        $class = new class {
             public function __toString(): string
             {
                 return '{}';

Tests/ParameterBagTest.php

@@ -206,7 +206,7 @@ public function testGetIntExceptionWithInvalid()
 
     public function testGetString()
     {
-        $bag = new ParameterBag(['integer' => 123, 'bool_true' => true, 'bool_false' => false, 'string' => 'abc', 'stringable' => new class() implements \Stringable {
+        $bag = new ParameterBag(['integer' => 123, 'bool_true' => true, 'bool_false' => false, 'string' => 'abc', 'stringable' => new class implements \Stringable {
             public function __toString(): string
             {
                 return 'strval';

Tests/RequestTest.php

@@ -2213,7 +2213,7 @@ public function testFactory()
 
     public function testFactoryCallable()
     {
-        $requestFactory = new class() {
+        $requestFactory = new class {
             public function createRequest(): Request
             {
                 return new NewRequest();

Tests/Session/Storage/Proxy/AbstractProxyTest.php

@@ -26,7 +26,7 @@ class AbstractProxyTest extends TestCase
 
     protected function setUp(): void
     {
-        $this->proxy = new class() extends AbstractProxy {};
+        $this->proxy = new class extends AbstractProxy {};
     }
 
     public function testGetSaveHandlerName()

Tests/StreamedJsonResponseTest.php

@@ -132,14 +132,14 @@ public function testResponseOtherTraversable()
     {
         $arrayObject = new \ArrayObject(['__symfony_json__' => '__symfony_json__']);
 
-        $iteratorAggregate = new class() implements \IteratorAggregate {
+        $iteratorAggregate = new class implements \IteratorAggregate {
             public function getIterator(): \Traversable
             {
                 return new \ArrayIterator(['__symfony_json__']);
             }
         };
 
-        $jsonSerializable = new class() implements \IteratorAggregate, \JsonSerializable {
+        $jsonSerializable = new class implements \IteratorAggregate, \JsonSerializable {
             public function getIterator(): \Traversable
             {
                 return new \ArrayIterator(['This should be ignored']);
@@ -187,7 +187,7 @@ public function testResponseStatusCode()
 
     public function testPlaceholderAsObjectStructure()
     {
-        $object = new class() {
+        $object = new class {
             public $__symfony_json__ = 'foo';
             public $bar = '__symfony_json__';
         };