Fix ComponentGroup not linked to Layout/Page in CwaFixtureBuilder #1513

Job	Run time
PHP-CS-Fixer (PHP 8.5)	15s
PHPUnit (Symfony 7.4) (PHP 8.5)	39s
Behat (Symfony 8.1) (PHP 8.5)	4m 44s
PHPUnit (Symfony NEXT 8.2) (PHP 8.5)	50s
Behat (Symfony 7.4) (PHP 8.5)	4m 44s
Behat (Symfony NEXT 8.2) (PHP 8.5)	4m 29s
PHPUnit (Symfony 8.1) (PHP 8.5)	47s
PHPUnit (Symfony ^7.4) (PHP 8.5) (lowest dependencies)	35s
Behat (Symfony ^7.4) (PHP 8.5) (lowest dependencies)	3m 49s
	20m 52s

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