Spark 4.2: native Iceberg REST catalog scan test fails under Comet #4969

The Comet test CometIcebergNativeSuite: "REST catalog with native Iceberg scan" is skipped on Spark 4.2 (assume(!isSpark42Plus, ...)).

No Iceberg spark-runtime is published for Spark 4.2, so the build reuses the 4.0 runtime; Spark 4.2 turned connector.catalog.View from an interface into a class, which affects the Iceberg integration (see the Iceberg availability probes already added for 4.2). This issue tracks re-enabling the native Iceberg REST catalog scan test on Spark 4.2.