非持久化客户端注册示例ID为null

[llm163520]

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Actually behavior
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Desktop (please complete the following information):

• OS: [e.g. Centos]
• Version [e.g. nacos-server 2.2.3, nacos-client 2.1.0]
• Module [e.g. naming/config]
• SDK [e.g. original, spring-cloud-alibaba-nacos]

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当参数spring.cloud.nacos.discovery.ephemeral=true，非持久化实例时；grpc注册后返回的实例ID(instanceId)为null

当参数spring.cloud.nacos.discovery.ephemeral=false，持久化实例时；能正常返回实例ID(instanceId)

[KomachiSion]

fixed by #10812