[Test🧪] Add replacement and cleanup tests for TopicQueueMappingInfoTable

[mxsm]

Prerequisites

• I have searched existing test issues

Test Scope

Module: static-topic queue mapping table
File: rocketmq-namesrv/src/route/tables/topic_queue_mapping_table.rs
Coverage: extend table tests around replace, remove, and cleanup semantics.

Test Cases

• Re-registering the same topic and broker returns the previous mapping and stores the new mapping.
• remove_broker returns None for an unknown topic and for an unknown broker.
• Removing the last broker leaves an empty topic until cleanup_empty_topics removes it.
• remove_topic returns all previous broker mappings for that topic.
• Validate with cargo test -p rocketmq-namesrv topic_queue_mapping_table.

Willing to contribute?

• I can submit a PR for this