chore: update test psc instance credentials

Author: kgala2

.ci/cloudbuild.yaml

@@ -13,21 +13,6 @@
 # limitations under the License.
 
 steps:
-  - id: check the private DNS zone and the private connection
-    name: gcr.io/cloud-builders/git
-    entrypoint: bash
-    args:
-    - '-c'
-    - |
-        apt-get update
-        apt-get install dnsutils -y
-        echo "dig ${_DNS_NAME} ... (with +trace)"
-        dig +trace ${_DNS_NAME}
-        echo "dig ${_DNS_NAME} ... (without +trace)"
-        dig ${_DNS_NAME}
-        echo "cat /etc/resolv.conf"
-        cat /etc/resolv.conf
-
   - id: run integration tests
     name: python:${_VERSION}
     entrypoint: bash
@@ -124,10 +109,9 @@ availableSecrets:
 substitutions:
   _VERSION: ${_VERSION}
   _IP_TYPE: ${_IP_TYPE}
-  _DNS_NAME: ${_DNS_NAME}
 
 options:
   dynamicSubstitutions: true
   pool:
     name: ${_POOL_NAME}
-  logging: CLOUD_LOGGING_ONLY
+  logging: CLOUD_LOGGING_ONLY