fix: Small fix to BigQuery quota project parameter implementation (#1632)

* Fix: Quota project optional parameter was not working properly. A small fix was necessary on cleints.py

* style: Reformat clients.py

---------

Co-authored-by: Neil Johnson <neiljohnson@google.com>

Author: FelipeKalinoski

data_validation/clients.py

@@ -159,8 +159,10 @@ def get_bigquery_client(
             quota_project_id=client_project_id,
         )
 
+    billing_project = client_project_id if client_project_id else project_id
+
     return bigquery_connect(
-        project_id=project_id,
+        project_id=billing_project,
         dataset_id=dataset_id,
         credentials=credentials,
         bigquery_client=google_client,