[Validator] Add PHPDoc to GroupSequence
attribute class and properties
#53428
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This pull request adds detailed PHPDoc comments to the GroupSequence class in the Symfony\Component\Validator\Constraints namespace. The added documentation includes a comprehensive class description and descriptive comments for each public property and the constructor.
These changes are in response to the issue #51920 and follow the same documentation style and standards as Symfony's existing components.