RabbitMQ IntegrationTests are flaky

[rngcntr]

The RabbitMQ integration tests regularly fail with stack traces like this one:

[xUnit.net 00:00:46.56]     Motor.Extensions.Hosting.RabbitMQ_IntegrationTest.RabbitMQTests.ConsumerStartAsync_CheckParallelProcessing_EnsureAllMessagesAreConsumed [FAIL]
  Failed Motor.Extensions.Hosting.RabbitMQ_IntegrationTest.RabbitMQTests.ConsumerStartAsync_CheckParallelProcessing_EnsureAllMessagesAreConsumed [12 s]
  Error Message:
   RabbitMQ.Client.Exceptions.BrokerUnreachableException : None of the specified endpoints were reachable
---- RabbitMQ.Client.Exceptions.OperationInterruptedException : The AMQP operation was interrupted: AMQP close-reason, initiated by Library, code=0, text='End of stream', classId=0, methodId=0, cause=System.IO.EndOfStreamException: Reached the end of the stream. Possible authentication failure.
   at RabbitMQ.Client.Impl.InboundFrame.ReadFrom(Stream reader, Byte[] frameHeaderBuffer, ArrayPool`1 pool, UInt32 maxMessageSize)
   at RabbitMQ.Client.Framing.Impl.Connection.MainLoopIteration()
   at RabbitMQ.Client.Framing.Impl.Connection.MainLoop()
  Stack Trace:
     at RabbitMQ.Client.ConnectionFactory.CreateConnection(IEndpointResolver endpointResolver, String clientProvidedName)
   at RabbitMQ.Client.ConnectionFactory.CreateConnection(String clientProvidedName)
   at RabbitMQ.Client.ConnectionFactory.CreateConnection()
   at Motor.Extensions.Hosting.RabbitMQ_IntegrationTest.RabbitMQFixture.CreateConnection() in /home/runner/work/motornet/motornet/test/Motor.Extensions.Hosting.RabbitMQ_IntegrationTest/RabbitMQFixture.cs:line 59
   at Motor.Extensions.Hosting.RabbitMQ_IntegrationTest.RabbitMQFixture.get_Connection() in /home/runner/work/motornet/motornet/test/Motor.Extensions.Hosting.RabbitMQ_IntegrationTest/RabbitMQFixture.cs:line 30
   at Motor.Extensions.Hosting.RabbitMQ_IntegrationTest.RabbitMQTestBuilder.GetConsumer[T](IHostApplicationLifetime applicationLifetime) in /home/runner/work/motornet/motornet/test/Motor.Extensions.Hosting.RabbitMQ_IntegrationTest/RabbitMQTestBuilder.cs:line 231
   at Motor.Extensions.Hosting.RabbitMQ_IntegrationTest.RabbitMQTests.ConsumerStartAsync_CheckParallelProcessing_EnsureAllMessagesAreConsumed() in /home/runner/work/motornet/motornet/test/Motor.Extensions.Hosting.RabbitMQ_IntegrationTest/RabbitMQTests.cs:line 197
--- End of stack trace from previous location ---
----- Inner Stack Trace -----
   at RabbitMQ.Client.Impl.SimpleBlockingRpcContinuation.GetReply(TimeSpan timeout)
   at RabbitMQ.Client.Impl.ModelBase.ConnectionOpen(String virtualHost, String capabilities, Boolean insist)
   at RabbitMQ.Client.Framing.Impl.Connection.Open(Boolean insist)
   at RabbitMQ.Client.Framing.Impl.Connection..ctor(IConnectionFactory factory, Boolean insist, IFrameHandler frameHandler, String clientProvidedName)
   at RabbitMQ.Client.Framing.Impl.Connection..ctor(IConnectionFactory factory, Boolean insist, IFrameHandler frameHandler, ArrayPool`1 memoryPool, String clientProvidedName)
   at RabbitMQ.Client.Framing.Impl.AutorecoveringConnection.Init(IFrameHandler fh)
   at RabbitMQ.Client.Framing.Impl.AutorecoveringConnection.Init(IEndpointResolver endpoints)
   at RabbitMQ.Client.ConnectionFactory.CreateConnection(IEndpointResolver endpointResolver, String clientProvidedName)

I suspect that the issue is a not-yet-healthy RabbitMQ container.

[rngcntr]

Solved by #776