BigQuery: test_create_routine test fails on VPC-SC tests #8550
Description
The test_create_routine test in system.py uses the cloud-samples-data GCS bucket, but this crosses a VPC boundary. The VPC team maintains a mirror of this sample data and would prefer we provide a way to override the bucket via an environment variable.
The Ruby samples take an environment variable GCLOUD_TEST_SAMPLES_BUCKET for the same purpose.