Revert "Drain excess credits when using sessions to ensure FIFO (#40457)"

[Yello001]

had trouble with #40457

await link.DrainAsyc(cancellationToken).ConfigureAwait(false);

caused:
System.TimeoutException: The operation did not complete within the allocated time 00:01:00 for object drain.
at Microsoft.Azure.Amqp.ExceptionDispatcher.Throw(Exception exception)
at Microsoft.Azure.Amqp.AsyncResult.End[TAsyncResult](IAsyncResult result)
at Microsoft.Azure.Amqp.ReceivingAmqpLink.DrainAsyncResult.End(IAsyncResult result)
at Microsoft.Azure.Amqp.ReceivingAmqpLink.<>c.b__35_1(IAsyncResult r)
at System.Threading.Tasks.TaskFactory1.FromAsyncCoreLogic(IAsyncResult iar, Func2 endFunction, Action1 endAction, Task1 promise, Boolean requiresSynchronization)
--- End of stack trace from previous location ---
at Azure.Messaging.ServiceBus.Amqp.AmqpReceiver.ReceiveMessagesAsyncInternal(Int32 maxMessages, Nullable`1 maxWaitTime, TimeSpan timeout, CancellationToken cancellationToken) in ...\azure-sdk-for-net\sdk\servicebus\Azure.Messaging.ServiceBus\src\Amqp\AmqpReceiver.cs:line 375

and subsequent in ServiceBusSessionProcessor.ProcessErrorAsync handler:
Azure.Messaging.ServiceBus.ServiceBusException: The session lock has expired on the MessageSession. Accept a new MessageSession. TrackingId:, SystemTracker:...
(SessionLockLost). For troubleshooting information, see https://aka.ms/azsdk/net/servicebus/exceptions/troubleshoot.
at Azure.Messaging.ServiceBus.Amqp.AmqpReceiver.ThrowIfSessionLockLost()
at Azure.Messaging.ServiceBus.Amqp.AmqpReceiver.ReceiveMessagesAsyncInternal(Int32 maxMessages, Nullable1 maxWaitTime, TimeSpan timeout, CancellationToken cancellationToken) at Azure.Messaging.ServiceBus.Amqp.AmqpReceiver.<>c.<<ReceiveMessagesAsync>b__44_0>d.MoveNext() --- End of stack trace from previous location --- at Azure.Messaging.ServiceBus.ServiceBusRetryPolicy.RunOperation[T1,TResult](Func4 operation, T1 t1, TransportConnectionScope scope, CancellationToken cancellationToken, Boolean logTimeoutRetriesAsVerbose)
at Azure.Messaging.ServiceBus.ServiceBusRetryPolicy.RunOperation[T1,TResult](Func4 operation, T1 t1, TransportConnectionScope scope, CancellationToken cancellationToken, Boolean logTimeoutRetriesAsVerbose) at Azure.Messaging.ServiceBus.Amqp.AmqpReceiver.ReceiveMessagesAsync(Int32 maxMessages, Nullable1 maxWaitTime, CancellationToken cancellationToken)
at Azure.Messaging.ServiceBus.ServiceBusReceiver.ReceiveMessagesAsync(Int32 maxMessages, Nullable`1 maxWaitTime, Boolean isProcessor, CancellationToken cancellationToken)
at Azure.Messaging.ServiceBus.SessionReceiverManager.ReceiveAndProcessMessagesAsync(CancellationToken processorCancellationToken)

This reverts commit 8ee6482.

[github-actions]

Thank you for your contribution @Yello001! We will review the pull request and get back to you soon.

[Yello001]

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[jsquire]

Hi @Yello001. Thank you for your contribution and interest in improving the Azure developer experience. Unfortunately, this is not a change that we'll be moving forward with. We'd be very interested in understanding and assisting with the problem that you encountered. If you would like assistance, please open an issue with details of your scenario.