ci: cover clientless BigQuery imports

Author: cofin

.github/ci/provider-groups.json

@@ -23,6 +23,7 @@
     "LICENSE"
   ],
   "compatibility_test_paths": [
+    "tests/test_bigquery.py::test_plugin_imports_without_google_cloud_bigquery",
     "tests/test_cockroachdb.py::test_plugin_imports_without_psycopg",
     "tests/test_elasticsearch.py::test_plugin_imports_without_elasticsearch_clients",
     "tests/test_mongodb.py::test_plugin_imports_without_pymongo",