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
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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/Messenger/DoctrineOpenTransactionLoggerMiddlewareTest.php

@@ -29,7 +29,7 @@ class DoctrineOpenTransactionLoggerMiddlewareTest extends MiddlewareTestCase
 
     protected function setUp(): void
     {
-        $this->logger = new class() extends AbstractLogger {
+        $this->logger = new class extends AbstractLogger {
             public array $logs = [];
 
             public function log($level, $message, $context = []): void

Tests/Validator/Constraints/UniqueEntityValidatorTest.php

@@ -926,7 +926,7 @@ public static function resultWithEmptyIterator(): array
         $entity = new SingleIntIdEntity(1, 'foo');
 
         return [
-            [$entity, new class() implements \Iterator {
+            [$entity, new class implements \Iterator {
                 public function current(): mixed
                 {
                     return null;
@@ -950,7 +950,7 @@ public function rewind(): void
                 {
                 }
             }],
-            [$entity, new class() implements \Iterator {
+            [$entity, new class implements \Iterator {
                 public function current(): mixed
                 {
                     return false;