Skip Iceberg DDL tests on PR CI (#980)

Skips Iceberg DDL tests on PR CI to avoid running out of disk space.

Author: scott-routledge2

BodoSQL/bodosql/tests/test_types/test_iceberg_ddl.py

@@ -18,7 +18,7 @@
 from BodoSQL.bodosql.bodosql_types.rest_catalog import RESTCatalog
 from bodosql.tests.utils import assert_equal_par, replace_type_varchar
 
-pytestmark = pytest_polaris + pytest_one_rank
+pytestmark = pytest_polaris + pytest_one_rank + [pytest.mark.slow]
 
 
 @pytest.fixture(scope="session")