minor #58443 Various CS fix for consistency (alexandre-daubois)

This PR was merged into the 7.2 branch.

Discussion
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Various CS fix for consistency

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

A few fixes to match the rest of the codebase:

- Remove useless `else` branches (as done in symfony/symfony#57897)
- Instantiating anonymous classes should not be followed by parentheses
- An attribute without args should not be followed by parentheses

Commits
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75582694ec Various CS fix for consistency

Author: fabpot

Tests/Fixtures/application_signalable.php

@@ -12,7 +12,7 @@
 }
 require $vendor.'/vendor/autoload.php';
 
-(new class() extends SingleCommandApplication implements SignalableCommandInterface {
+(new class extends SingleCommandApplication implements SignalableCommandInterface {
     public function getSubscribedSignals(): array
     {
         return [SIGINT];