[Validator] UniqueEntity - add warning about not supported types and association mappings. #21262
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This constraint does not support Doctrine types such as simple_array, json, or jsonb, nor does it handle association mappings like One-To-Many and Many-To-Many relationships. It may also not work correctly with custom Doctrine types. To perform uniqueness checks on such fields, you must define a custom repositoryMethod that implements the desired logic.