[BUG] The base level `event-hub-name` property should be overridden when sub-level `event-hub-name` property configured

[haoozhang]

Describe the bug

When using the spring-cloud-azure-starter-eventhubs dependency, if I specify the properties in the application.yaml as follows, I think the expected result is that the event-hub-name in the producer and consumer section will override the base event-hub-name, that is, the application will eventually use the aaaa event hub, not bbbb.

spring:
  cloud:
    azure:
      eventhubs:
        namespace: evhns-sample
        event-hub-name: bbbb
        consumer:
          consumer-group: $Default
          event-hub-name: aaaa
        producer:
          event-hub-name: aaaa

But for the following code,

    @Autowired
    private EventHubConsumerClient consumerClient;

    @Autowired
    private EventHubProducerClient producerClient;
    
    @Override
    public void run(String... args) throws Exception {
        LOGGER.info("Sending message using Event Hub producer client. ==> {}", producerClient.getEventHubName());
        producerClient.send(Arrays.asList(new EventData("Test event")));
        LOGGER.info("Sent message to Event Hub.");
        producerClient.close();

        TimeUnit.SECONDS.sleep(3);
        LOGGER.info("Receiving message using Event Hub consumer client. ==> {}", consumerClient.getEventHubName());
        String PARTITION_ID = "0";
        IterableStream<PartitionEvent> partitionEvents = consumerClient.receiveFromPartition(PARTITION_ID, 1,
            EventPosition.earliest());
        Iterator<PartitionEvent> iterator = partitionEvents.stream().iterator();
        if (iterator.hasNext()) {
            PartitionEvent pe = iterator.next();
            LOGGER.info("Received message: {}", pe.getData().getBodyAsString());
        } else {
            LOGGER.error("Failed to receive message.");
        }
    }

The application logs show that it still use bbbb, not the aaaa, which is inconsistent as above expectation.

Sending message using Event Hub producer client. ==> bbbb
....
Receiving message using Event Hub consumer client. ==> bbbb

Exception or Stack Trace
No exception, just inconsistent behavior.

To Reproduce
Steps to reproduce the behavior:

Run this repo code: https://github.com/haoozhang/spring-cloud-azure-starter-eventhubs-sample

Code Snippet
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Expected behavior
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Screenshots
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Setup (please complete the following information):

• OS: [e.g. iOS]
• IDE: [e.g. IntelliJ] IDEA
• Library/Libraries: [e.g. com.azure:azure-core:1.16.0 (groupId:artifactId:version)] spring-cloud-azure-starter-eventhubs 5.18.0
• Java version: [e.g. 8] 17
• App Server/Environment: [e.g. Tomcat, WildFly, Azure Function, Apache Spark, Databricks, IDE plugin or anything special]
• Frameworks: [e.g. Spring Boot, Micronaut, Quarkus, etc]

If you suspect a dependency version mismatch (e.g. you see NoClassDefFoundError, NoSuchMethodError or similar), please check out Troubleshoot dependency version conflict article first. If it doesn't provide solution for the problem, please provide:

• verbose dependency tree (mvn dependency:tree -Dverbose)
• exception message, full stack trace, and any available logs

Additional context
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• Bug Description Added
• Repro Steps Added
• Setup information Added

[github-actions]

@anuchandy @conniey @lmolkova

[github-actions]

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