fix: update_table_description like the seed materialization

dbt/adapters/bigquery/impl.py

@@ -625,11 +625,12 @@ def update_columns(self, relation, columns):
 
     @available.parse_none
     def update_table_description(
-        self, relation: BigQueryRelation, description: str
+        self, database: str, schema: str, identifier: str, description: str
     ):
         conn = self.connections.get_thread_connection()
         client = conn.handle
-        table_ref = self.get_table_ref_from_relation(relation)
+
+        table_ref = self.connections.table_ref(database, schema, identifier)
         table = client.get_table(table_ref)
         table.description = description
         client.update_table(table, ["description"])

dbt/include/bigquery/macros/adapters.sql

@@ -99,7 +99,9 @@
 {% macro bigquery__persist_docs(relation, model, for_relation, for_columns) -%}
   {% if for_columns and config.persist_column_docs() and model.columns %}
     {% do alter_column_comment(relation, model.columns) %}
-    {% do adapter.update_table_description(relation, model.description) %}
+  {% endif %}
+  {% if config.persist_relation_docs() and 'description' in model %}
+    {{ adapter.update_table_description(model['database'], model['schema'], model['alias'], model['description']) }}
   {% endif %}
 {% endmacro %}