fix: Adapt project_id_exists validator for updated pydantic version

sdk/python/feast/infra/offline_stores/bigquery.py

@@ -114,7 +114,7 @@ class BigQueryOfflineStoreConfig(FeastConfigBaseModel):
 
     @field_validator("billing_project_id")
     def project_id_exists(cls, v, values, **kwargs):
-        if v and not values["project_id"]:
+        if v and not (values.data and values.data["project_id"]):
             raise ValueError(
                 "please specify project_id if billing_project_id is specified"
             )

sdk/python/tests/unit/infra/offline_stores/test_bigquery.py

@@ -82,3 +82,29 @@ def test_to_arrow_timeout(self, big_query_result):
             self.retrieval_job._execute_query.assert_called_once_with(
                 query=self.query, timeout=30
             )
+
+
+class TestBigQueryRetrievalJobWithBillingProject:
+    query = "SELECT * FROM bigquery"
+    client = Mock()
+
+    def test_project_id_exists(self):
+        with pytest.raises(ValueError):
+            retrieval_job = BigQueryRetrievalJob(
+                query=self.query,
+                client=self.client,
+                config=RepoConfig(
+                    registry="gs://ml-test/repo/registry.db",
+                    project="test",
+                    provider="gcp",
+                    online_store=SqliteOnlineStoreConfig(type="sqlite"),
+                    offline_store=BigQueryOfflineStoreConfig(
+                        type="bigquery",
+                        dataset="feast",
+                        billing_project_id="test-billing-project",
+                    ),
+                ),
+                full_feature_names=True,
+                on_demand_feature_views=[],
+            )
+            retrieval_job.to_df()