KAFKA-17407: Fix flaky ShareGroupHeartbeatRequestTest.testPartitionAssignmentWithChangingTopics

[m1a2st]

Jira: https://issues.apache.org/jira/browse/KAFKA-17407 In my opinion, the old test run twice in https://github.com/apache/kafka/blob/4a485ddb71c844acc8bf241feda1fcbffc5ce9be/core/src/test/scala/unit/kafka/server/ShareGroupHeartbeatRequestTest.scala#L460 and make the epoch plus twice is wired. I find the reponse like, it means the hearbeat doen't get the right data at the first time

shareGroupHeartbeatResponses: 
    ShareGroupHeartbeatResponseData(
        throttleTimeMs=0, 
        errorCode=0, 
        errorMessage=null, 
        memberId='9k-Z78-hQrClozREJ3LLXw', 
        memberEpoch=2, 
        heartbeatIntervalMs=500, 
        assignment=Assignment(
            topicPartitions=[
                TopicPartitions(
                    topicId=jU420_8ETCefApr4z8PDHQ, 
                    partitions=[0, 1]
                )
            ]
        )
    )
shareGroupHeartbeatResponses: 
    ShareGroupHeartbeatResponseData(
        throttleTimeMs=0, 
        errorCode=0, 
        errorMessage=null, 
        memberId='9k-Z78-hQrClozREJ3LLXw', 
        memberEpoch=3, 
        heartbeatIntervalMs=500, 
        assignment=Assignment(
            topicPartitions=[
                TopicPartitions(
                    topicId=jU420_8ETCefApr4z8PDHQ, 
                    partitions=[0, 1]
                ), 
                TopicPartitions(
                    topicId=RWmPmQI-R3azvx2lQBhKEQ,
                    partitions=[0, 1, 2]
                )
            ]
        )
    )

I think the root cause is https://github.com/apache/kafka/blob/4a485ddb71c844acc8bf241feda1fcbffc5ce9be/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java#L2197 https://github.com/apache/kafka/blob/4a485ddb71c844acc8bf241feda1fcbffc5ce9be/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java#L2178 It seen need some time to update the updatedMember variable, thus I make the thread to sleep 1s.

Committer Checklist (excluded from commit message)

• [ ] Verify design and implementation
• [ ] Verify test coverage and CI build status
• [ ] Verify documentation (including upgrade notes)