test(dlp): ensure GOOGLE_CLOUD_TESTS_IN_VPCSC is down cast for env variables (#9274)
test(dlp): ensure GOOGLE_CLOUD_TESTS_IN_VPCSC is down cast for env variables (#9274)

Tests currently fail outside of git due to minor differences in environment variable casing. closes bug reported by siddinesh@

tswast/google-cloud-python,GoogleCloudPlatform/gcloud-python,tseaver/google-cloud-python,tswast/google-cloud-python,googleapis/google-cloud-python,googleapis/google-cloud-python,tseaver/google-cloud-python,GoogleCloudPlatform/gcloud-python,tseaver/google-cloud-python,tswast/google-cloud-python