Fixing nullability issue of message and adding test coverage #5907
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Motivation and Context
#5834 refactors
AwsServiceException
to add the SDK diagnostics conditionally and refactors thegetMessage
impl to use String joiner. This change makes AwsServiceException's getMessage to always be not null which can break customers who are relying on nullability.This change preserves the behavior pre #5834.
Added test coverage.