Fix topic operator loop for unmanaged topics

[padilo]

Type of change

• Bugfix

Description

Fixes a bug in the topic operator with unmanaged topics, that keeps updating the custom resources even isn't going to update the Kafka Topic

Closes #10380

Checklist

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

• [x] 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