[GH] (rocketmq/fix/enable-retry-topic-v2-by-default): Workflow run "Build and Run Tests by Maven" failed!

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The GitHub Actions job "Build and Run Tests by Maven" on rocketmq.git/fix/enable-retry-topic-v2-by-default has failed.
Run started by GitHub user wang-jiahua (triggered by wang-jiahua).

Head commit for run:
8ff7c1603e225f07553386f8e6f84d925d09f9a9 / wangjiahua.wjh <wa...@alibaba-inc.com>
[ISSUE #9633] Enable retry topic V2 by default to prevent name collision

V1 retry topic naming uses underscore as separator (%RETRY%{cid}_{topic}),
which is ambiguous because both topic and group names may contain underscores.
This causes different (group, topic) pairs to map to the same retry topic,
leading to cross-topic consumption and potential data leakage.

V2 naming (using '+' separator) already exists but was disabled by default.
This commit changes enableRetryTopicV2 default from false to true.

Existing V1 retry topics are still readable because
retrieveMessageFromPopRetryTopicV1 remains true (backward compatible).

Changes:
- BrokerConfig: enableRetryTopicV2 default false -> true
- KeyBuilderTest: 3 new tests demonstrating V1 collision and V2 correctness

Report URL: https://github.com/apache/rocketmq/actions/runs/28492469936

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