Improve OperationInternalBase

[Yao725]

As we provide the customer with the method WaitForCompletion and WaitForCompletionResponse, it might make unnecessary API call and cause serialization failure when the customer sets the parameter waitForCompletion to true but still calls WaitForCompletion by themselves.

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[Yao725]

Will be merged after Azure/azure-sdk-for-net#26962