fix(#446605): broaden shutdown OperationCanceledException guard in ReceiverWrapper - #114

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Possible null reference return.

Code should not contain trailing whitespace (https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/SA1028.md)

Non-nullable property 'Sender' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'ResourceId' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'Messages' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference argument for parameter 'resourceId' in 'void ServiceBusMeter.RecordDeliveryCount(int value, string clientType, string resourceId, string? payloadTypeId)'.

Possible null reference argument for parameter 'clientType' in 'void ServiceBusMeter.RecordDeliveryCount(int value, string clientType, string resourceId, string? payloadTypeId)'.

Possible null reference return.

Possible null reference assignment.

Dereference of a possibly null reference.

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