test(e2e): add more details on exception for RBAC list

[nilgaar]

Description

https://gcsweb-ci.apps.ci.l2s4.p1.openshiftapps.com/gcs/test-platform-results/logs/periodic-ci-redhat-developer-rhdh-main-e2e-tests-gke-helm-nightly/1895006114454441984/artifacts/e2e-tests-gke-helm-nightly/redhat-developer-rhdh-gke-helm-nightly/artifacts/showcase-rbac-k8s-ci-nightly/index.html#?testId=93e820fe67e1d967a4f6-678fffe6e754799e571e&q=s:failed

https://redhat-internal.slack.com/archives/C07D05S8U82/p1740643455317459

Which issue(s) does this PR fix

• Fixes #?

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[openshift-ci]

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• e2e-tests/OWNERS

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[openshift-ci]

@nilgaar: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-tests	9643952	link	true	/test e2e-tests

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[github-actions]

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