Fix #9270: Incorrect TO ResourceConflict message

[tombentley]

Type of change

• Bugfix

Description

Change BatchingTopicController#topics from being a Map<String, HashSet<KubeRef>> to Map<String, ArrayList<KubeRef>> so that the encounter order of KubRefs is maintained and the byCreationTime at the point we validate the single managing resource has a stable ordering in the presence of KafkaTopics with the same creationTimestamp.

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

[fvaleri]

LGTM. Thanks.

This fixes #9270.