Refactor GlobalConfigurationCategoryConfigurator to remove raw type cast in describe()

[somiljain2006]

Refactor GlobalConfigurationCategoryConfigurator.describe() to eliminate raw types and remove the redundant cast required for pre-JDK 11 compatibility by introducing generics (Set<Attribute<GlobalConfigurationCategory, ?>>). Replace the inline unchecked cast of NOP with a helper method (typedNop()) that encapsulates the suppression, keeps the code clean, and maintains existing behavior.

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