Antalya 25.8: Port of #959 and #1026 iceberg addtional columns in system tables#1095

Enmk merged 2 commits intoantalya-25.8Altinity/ClickHouse:antalya-25.8from

ports/25.8/959_iceberg_addtional_columns_in_system_tablesAltinity/ClickHouse:ports/25.8/959_iceberg_addtional_columns_in_system_tablesCopy head branch name to clipboard