Failed inserts in BigQuery Loader 2.0.0

With the release of BigQuery v2, the events that fail to be loaded to BigQuery are now written to the bad rows pubsub topic sp-rt-pipeline-bad-prod1. Previously those failures where written to the failed inserts GCS bucket (e.g. sp-storage-loader-failed-inserts-prod1-com_acme). 

This change was made to consolidate all types of event failures into a single place. For a comprehensive overview of all the changes in BigQuery Loader 2.0.0, please refer to our upgrade guide here.