Fix Unit Tests on s390x.

[dandotimujahid]

Type of change

Select the type of your PR

• Bugfix

Description

The primary change ensures that tests pass regardless of platform-specific variations in error messages by using the anyof() function.
For instance, in the testKafkaWithInvalidRole test:
On Intel, exception.getMessage() returns:
invalid: spec.maintenanceTimeWindows[0]: Invalid value: "null": spec.maintenanceTimeWindows[0] in body must be of type string:
On s390x, it returns:
invalid: spec.maintenanceTimeWindows: Invalid value: "null": spec.maintenanceTimeWindows in body must be of type string:
Similar discrepancies exist in other tests. Instead of using conditional logic like
if-else, the anyof() approach is aligned with the previously used community standards to handle such known K8s errors across different platforms.

Checklist

Please go through this checklist and make sure all applicable tasks have been done

• Write tests
• Make sure all tests pass
• Update documentation
• Check RBAC rights for Kubernetes / OpenShift roles
• Try your changes from Pod inside your Kubernetes and OpenShift cluster, not just locally
• Reference relevant issue(s) and close them after merging
• Update CHANGELOG.md
• Supply screenshots for visual changes, such as Grafana dashboards

[scholzj]

Maybe you can improve the description and explain a bit more in detaild why are the tests failing on some platforms?

[dandotimujahid]

@scholzj Thanks for approving the PR. I will update the description.