Fix str_getcsv() usage for PHP 8.4

---- Drupal\Tests\Core\Mail\Plugin\Mail\SymfonyMailerTest ----
Status    Group      Filename          Line Function                            
--------------------------------------------------------------------------------
Fail      Other      phpunit-624.xml      0 Drupal\Tests\Core\Mail\Plugin\Mail\
    PHPUnit Test failed to complete; Error: PHPUnit 10.5.30 by Sebastian
    Bergmann and contributors.
    
    Runtime:       PHP 8.4.0RC1
    Configuration: /builds/issue/drupal-3427903/core/phpunit.xml.dist
    
    .D                                                                  2 / 2
    (100%)
    
    Time: 00:00.058, Memory: 10.00 MB
    
    1 test triggered 1 PHP deprecation:
    
    1)
    /builds/issue/drupal-3427903/core/lib/Drupal/Core/Mail/Plugin/Mail/SymfonyMailer.php:130
    str_getcsv(): the $escape parameter must be provided as its default value
    will change
    
    Triggered by:
    
    * Drupal\Tests\Core\Mail\Plugin\Mail\SymfonyMailerTest::testMail (2 times)
     
    /builds/issue/drupal-3427903/core/tests/Drupal/Tests/Core/Mail/Plugin/Mail/SymfonyMailerTest.php:70
    
    OK, but there were issues!
    Tests: 2, Assertions: 3, Deprecations: 1.

Related 📌 Fix https://wiki.php.net/rfc/deprecations_php_8_4#deprecate_proprietary_csv_escaping_mechanism Active

one named argument is enough

Moved changes to 📌 Fix https://wiki.php.net/rfc/deprecations_php_8_4#deprecate_proprietary_csv_escaping_mechanism Active

andypost → closed merge request !9646