minor #61372 chore: PHP CS Fixer - update heredoc handling (keradus)

This PR was merged into the 7.4 branch.

Discussion
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 chore: PHP CS Fixer - update heredoc handling

| Q             | A
| ------------- | ---
| Branch?       | 7.4
| 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 CS <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

Inspired while #61371 , but can be merged separately.

``@PHPxMigration`` and ``@Symfony`` ruleset have different config for those rules. I assume the difference is coming from supporting pre-7.2 PHP version earlier in the codebase, where heredoc closure and trailing comma had to be on separated lines - but it's no longer the case.

Can we benefit from newer PHP syntax and incorporate those changes? (yes, `trailing_comma_in_multiline`, part of ``@Symfony``, is already having this enabled!)
if so, i will also merge them into ``@Symfony`` ruleset itself afterwards.

with love by [PHP Coding Standards Fixer](https://cs.symfony.com/)

Commits
-------

f9956227bb6  chore: PHP CS Fixer - update heredoc handling

Author: nicolas-grekas

Tests/Command/DebugCommandTest.php

@@ -52,8 +52,9 @@ public function testDebugDeprecatedDefaults()
              * Symfony\Component\Form\Tests\Command\FooType
 
 
-            TXT
-            , $tester->getDisplay(true));
+            TXT,
+            $tester->getDisplay(true)
+        );
     }
 
     public function testDebugSingleFormType()
@@ -134,8 +135,9 @@ public function testDebugAmbiguousFormTypeInteractive()
             %A
             %A\A\AmbiguousType (Block prefix: "ambiguous")
             %A
-            TXT
-            , $output);
+            TXT,
+            $output
+        );
     }
 
     public function testDebugInvalidFormType()
@@ -183,8 +185,9 @@ class:%s
               Nested Options   -         %s
              ---------------- -----------%s
 
-            TXT
-            , $tester->getDisplay(true));
+            TXT,
+            $tester->getDisplay(true)
+        );
     }
 
     #[DataProvider('provideCompletionSuggestions')]