test(bigquery): skip geography test when expansion jars not available (#36555)

* test(bigquery): skip geography test when expansion jars not available

Skip the geography storage write API test when EXPANSION_JARS environment variable is not set, indicating the required jars haven't been built

* import os

Author: liferoad

sdks/python/apache_beam/io/gcp/bigquery_geography_it_test.py

@@ -20,6 +20,7 @@
 """Integration tests for BigQuery GEOGRAPHY data type support."""
 
 import logging
+import os
 import secrets
 import time
 import unittest
@@ -428,7 +429,10 @@ def test_geography_complex_geometries(self):
     hc.assert_that(p, hc.all_of(*pipeline_verifiers))
 
   @pytest.mark.uses_gcp_java_expansion_service
-  @pytest.mark.it_postcommit
+  @unittest.skipUnless(
+      os.environ.get('EXPANSION_JARS'),
+      "EXPANSION_JARS environment var is not provided, "
+      "indicating that jars have not been built")
   def test_geography_storage_write_api(self):
     """Test GEOGRAPHY with Storage Write API method."""
     table_name = 'geography_storage_write'