Prow link: https://prow.ci.openshift.org/view/gs/test-platform-results/logs/periodic-ci-redhat-developer-rhdh-release-1.8-e2e-gke-operator-nightly/2026930688191631360

Issue Description: The Backstage application failed to deploy for both the `showcase` and `showcase-rbac` projects, which prevented the E2E tests from running.

Error: 

InstallException: Duplicate plugin configuration for oci://ghcr.io/redhat-developer/rhdh-plugin-export-overlays/red-hat-developer-hub-backstage-plugin-orchestrator:bs_1.45.3__5.3.1!red-hat-developer-hub-backstage-plugin-orchestrator found in dynamic-plugins.yaml.

Failure Details: The build log shows that the Backstage instance never became ready, resulting in a timeout after 50 attempts. A key warning message indicates a problem with the GKE ingress: `Translation failed: invalid ingress spec: could not find service "showcase/backstage-rhdh"`. A similar error occurred for the `showcase-rbac` project.

Root Cause Analysis: The Backstage service did not start up correctly, so it was not available for the ingress controller to route traffic to. This is likely due to a misconfiguration in the service or deployment, or a problem with the underlying infrastructure.

Suggested Fix: The Backstage deployment and service configurations should be reviewed to ensure they are correctly defined and that the service is exposed properly for the GKE ingress.