GONRG-5062: refactore anthos pipeline

devops/gcp/pipeline/override-stages.yml

+variables:
+  OSDU_GCP_SERVICE: notification
+  OSDU_GCP_VENDOR: gcp
+  OSDU_GCP_HELM_DEPLOYMENT_DIR: "devops/gcp/deploy"
+  OSDU_GCP_HELM_CONFIG_DIR: "devops/gcp/configmap"
+  OSDU_GCP_HELM_NAMESPACE: "default"
+  OSDU_GCP_HELM_CONFIG_SERVICE_VARS: >
+    --set data.log_level=$OSDU_GCP_LOG_LEVEL 
+    --set data.google_audiences=$GOOGLE_AUDIENCE 
+    --set data.app_register=$OSDU_GCP_REGISTER_API
+  OSDU_GCP_HELM_CONFIG_SERVICE_VARS_DEV2: >
+    --set data.log_level=$OSDU_GCP_LOG_LEVEL 
+    --set data.google_audiences=$GOOGLE_AUDIENCE 
+    --set data.app_register=$OSDU_GCP_REGISTER_API
+  OSDU_GCP_HELM_DEPLOYMENT_SERVICE_VARS: >
+    --set data.image=$CI_REGISTRY_IMAGE/osdu-gcp-$OSDU_GCP_SERVICE:$CI_COMMIT_SHORT_SHA 
+    --set data.serviceAccountName=$OSDU_GCP_SERVICE-k8s
+  OSDU_GCP_HELM_CONFIG_SERVICE: "notification-config"
+  OSDU_GCP_HELM_DEPLOYMENT_SERVICE: "notification-deploy"
+  OSDU_GCP_HELM_PACKAGE_CHARTS: "devops/gcp/deploy devops/gcp/configmap"
+
+osdu-gcp-test:
+  variables:
+    ENVIRONMENT: $OSDU_GCP_ENVIRONMENT
+    REGISTER_BASE_URL: $OSDU_GCP_REGISTER_BASE_URL
+
+osdu-gcp-dev2-test:
+ variables:
+   ENVIRONMENT: $OSDU_GCP_ENVIRONMENT
+   REGISTER_BASE_URL: $OSDU_GCP_REGISTER_BASE_URL