update iceberg add files parameters (#38879)

Author: derrickaw

sdks/python/apache_beam/yaml/standard_io.yaml

@@ -418,9 +418,11 @@
         catalog_properties: 'catalog_properties'
         config_properties: 'config_properties'
         triggering_frequency_seconds: 'triggering_frequency_seconds'
+        manifest_file_size: 'manifest_file_size'
         location_prefix: 'location_prefix'
         partition_fields: 'partition_fields'
         table_properties: 'table_properties'
+        sort_fields: 'sort_fields'
         error_handling: 'error_handling'
     underlying_provider:
       type: beamJar

sdks/python/apache_beam/yaml/tests/iceberg_add_files.yaml

@@ -55,6 +55,9 @@ pipelines:
             catalog_properties:
               type: "hadoop"
               warehouse: "{TEMP_DIR}/dir"
+            manifest_file_size: 50
+            sort_fields:
+              - "rank desc"
 
   # Pipeline 3: Read from Iceberg and verify the contents
   - pipeline: