Update to Quarkus 3.8

[sophokles73]

Also adapted some unit tests to reflect changes in Kafka and k8s client libraries.

[sophokles73]

@calohmn with the update to Quarkus 3.8. the org.eclipse.hono.client.kafka.consumer.AsyncHandlingAutoCommitKafkaConsumerTest has started to fail. My assumption is that the behavior of the Kafka client used with Quarkus 3.8 has changed in comparison to Quarkus 3.2. I have tried to adapt accordingly but my understanding of our KafkaConsumer is limited. Would you mind taking a look what is going on?

[calohmn]

@sophokles73 Ok, I'll check.

[calohmn]

@sophokles73 Tests were failing with Kafka 3.6.1 because of changes to the MockConsumer.rebalance() method (see here).
Previously, the onPartitionsRevoked and onPartitionsAssigned handlers were not invoked there and we had used our own implementation in the Hono KafkaMockConsumer subclass.
The Hono implementation was mimicking the bahviour of the eager rebalance protocol, with the existing partitions being revoked first and then the new assignment getting applied.
The new MockConsumer.rebalance() implementation isn't doing that and is therefore mimicking the cooperative rebalance protocol.
Adding support for the old behaviour would require the use of reflection.
But since we are using cooperative rebalancing by default anyway (see #2908), I think it's better to concentrate on that.
I've adapted the tests accordingly.

[calohmn]

LGTM