Client.Subscribe() times out but the broker successfully created the consumer

#### Expected behavior
if the Client.Subscribe times out, the created consumer should be closed

#### Actual behavior
Client.Subscribe() times out.In fact, the broker successfully created the consumer. The time taken by the broker just exceeded the value of the operationTimeout.

#### System configuration
**Pulsar version**: 2.4.0

Start at Client.Subscribe and trace how operationTimeout interacts with the broker's consumer-creation response. Reproduce the case where the broker responds after the timeout, then verify that a consumer created in that situation is closed and that the normal subscription path still works.

Written by the indexing model from the issue text.