Add Completion on _waitForConfirmationActionBlock

[Gsantomaggio]

• To wait for _waitForConfirmationActionBlock.SendAsync in case is not completed. Add an exception handler on the ConfirmHandler since the code could raise an exception on the user side.
  That is for Failure to timeout messages when underlying socket fails #295
  Looking at the issue, I noticed the following:

exceptions.StackTraceString: at 
System.Threading.Tasks.Dataflow.DataflowBlock.SendAsync[TInput](ITargetBlock`1
 target, TInput item, CancellationToken cancellationToken)
   at 
RabbitMQ.Stream.Client.Reliable.ProducerFactory.<StandardProducer>b__4_2(Confirmation
 confirmation) in 
/_/RabbitMQ.Stream.Client/Reliable/ProducerFactory.cs:line 99
   at 

The line: ProducerFactory.cs:line 99 is what sends the confirmation of the messages to the user callback

rabbitmq-stream-dotnet-client/RabbitMQ.Stream.Client/Reliable/ProducerFactory.cs

Line 99 in 578589a

_confirmationPipe.RemoveUnConfirmedMessage(confirmationStatus, confirmation.PublishingId,

That would explain why you don't receive the notification anymore.

The PR adds the TLS certificates for Kubernetes only for testing.

@ricardSiliuk @ricsiLT if you have the opportunity to test let us know.
Thank you

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.09% 🎉

Comparison is base (c8e3726) 92.87% compared to head (38dc658) 92.97%.

❗ Current head 38dc658 differs from pull request most recent head 66d6c90. Consider uploading reports for the commit 66d6c90 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #298      +/-   ##
==========================================
+ Coverage   92.87%   92.97%   +0.09%     
==========================================
  Files         112      112              
  Lines        9689     9706      +17     
  Branches      771      773       +2     
==========================================
+ Hits         8999     9024      +25     
+ Misses        528      521       -7     
+ Partials      162      161       -1     

Files Changed	Coverage Δ
RabbitMQ.Stream.Client/RawProducer.cs	88.30% <100.00%> (+2.28%)	⬆️
...abbitMQ.Stream.Client/Reliable/ConfirmationPipe.cs	100.00% <100.00%> (ø)
RabbitMQ.Stream.Client/Reliable/ProducerFactory.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[Gsantomaggio]

As written in the comment The call is exposed to the user, so we need to catch any exception there could be an exception in the user code. we need to trap Exception to avoid blocking the iteration.