follow up: minor updates to the "golden path" negative test case

[mvacula02]

What

• refactor logging in CheckExpectedError()
• refactor invalid node pool update test case to not cause a spec wide failure on node pool GET failure

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mvacula02
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[openshift-ci]

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