KAFKA-19608: Test consumer group rebootstrap - #23040
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Summary
This PR adds regression coverage for KAFKA-19608.
The existing client rebootstrap tests cover manually assigned consumers, but they do not exercise a consumer that is an active member of a group. The new tests verify that both the classic and consumer group protocols continue consuming after the brokers swap client listener ports and the server requests a rebootstrap.
The test keeps the group-coordinator path isolated by disabling auto-commit, waits for the restarted brokers to become ready, and asserts that the subscribed consumer consumes data after rejoining.
Test plan
./gradlew :clients:clients-integration-tests:test --tests org.apache.kafka.clients.ClientRebootstrapTest.testClassicConsumerGroupRebootstrap --tests org.apache.kafka.clients.ClientRebootstrapTest.testConsumerGroupRebootstrap --no-build-cache --console=plain--rerun-tasks./gradlew :clients:clients-integration-tests:spotlessCheck :clients:clients-integration-tests:checkstyleTest --no-build-cache --console=plaingit diff --checkGenerated-by: OpenAI Codex (GPT-5)