Fix pattern consumer fails when a subscribed topic is deleted

[RobertIndie]

Motivation

When a topic that a pattern consumer is subscribed to is deleted, the consumer's sub-consumer tries to reconnect. However, it encounters a "topic not found" error. Currently, this error causes all pending waiters to fail, leading to an AlreadyClosedException when consumer.ReceiveAsync() is called. This issue can disrupt other consumers.

Pulsar.Client.Api.AlreadyClosedException: Consumer is already closed
   at <StartupCode$Pulsar-Client>[email protected]() in xxx/src/Pulsar.Client/Internal/ConsumerImpl.fs:line 1444
   at [email protected](ResumableStateMachine`1& sm)
   at [email protected](ResumableStateMachine`1& sm)

To fix this, if a sub-consumer encounters a "topic not found" error during reconnection, we should simply remove that consumer from the pattern consumer instead of throwing an exception.

Modification

• This change prevents pending waiters from failing when a consumer encounters a "topic not found" error during reconnection.