fix(ttstream): pingpong method refers to server interface defined in Kitex generation code when streamx is enabled and there are other streaming methods

[DMwangnima]

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fix

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fix(ttstream): 当开启 StreamX 并且存在 Streaming 方法时，Ping-Pong 方法引用 Kitex 生成代码中的服务接口定义

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en:
When StreamX is enabled, if both Streaming method and Ping-Pong method exist in the service, the Streaming method references the Service Interface Definition in the Kitex generated code, while the Ping-Pong method references the Service Interface Definition in the thriftgo generated code, which is not consistent.
After fixing, the Ping-Pong method also references the service interface definition in the Kitex generated code.
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zh(optional):
当开启 StreamX 时，若服务中同时存在 Streaming 方法和 Ping-Pong 方法，Streaming 方法会引用 Kitex 生成代码中的服务接口定义，而 Ping-Pong 方法会引用 thriftgo 生成代码中的服务接口定义，两者并不统一。
修复后，Ping-Pong 方法也会引用 Kitex 生成代码中的服务接口定义。

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