Preserve Kotlin list-item nullability inside Uni wrappers#2563
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Kotlin metadata was only inspected at the first wrapper level, so Uni<List<String>> lost item nullability and became [String]! instead of [String!]!. Walk the full wrapper chain and teach getGraphQLType() to skip non-collection wrappers when rendering nested lists. Fixes: quarkusio/quarkus#48350
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Summary
Uni<List<String>>(and similar Mutiny/CompletionStage wrappers) keeps list-item nullability from Kotlin metadata, producing[String!]!instead of[String]!.OperationCreator, while still only letting collection-like argument wrappers control argument-level nullability.Field.getGraphQLType()to skip non-collection wrappers when rendering nested list types, and add schema-builder coverage for the Uni+List nullability matrix.Fixes: quarkusio/quarkus#48350