fix(IoT): Fixing race conditions during cleanup in `AWSIoTStreamThread` #631

Job	Run time
Unit Test (AWSAPIGateway)	5m 36s
Unit Test (AWSAutoScaling)	3m 55s
Unit Test (AWSCloudWatch)	4m 8s
Unit Test (AWSCognitoAuth)	4m 30s
Unit Test (AWSCognitoIdentityProvider)	4m 21s
Unit Test (AWSComprehend)	5m 16s
Unit Test (AWSConnect)	6m 57s
Unit Test (AWSConnectParticipant)	4m 16s
Unit Test (AWSCore)	4m 46s
Unit Test (AWSDynamoDB)	3m 52s
Unit Test (AWSEC2)	5m 52s
Unit Test (AWSElasticLoadBalancing)	5m 12s
Unit Test (AWSIoT)	9m 58s
Unit Test (AWSKMS)	3m 35s
Unit Test (AWSKinesis)	4m 38s
Unit Test (AWSKinesisVideo)	3m 46s
Unit Test (AWSKinesisVideoArchivedMedia)	5m 19s
Unit Test (AWSKinesisVideoSignaling)	3m 18s
Unit Test (AWSKinesisVideoWebRTCStorage)	4m 25s
Unit Test (AWSLambda)	3m 41s
Unit Test (AWSLex)	3m 51s
Unit Test (AWSLogs)	3m 3s
Unit Test (AWSMachineLearning)	4m 16s
Unit Test (AWSMobileClient)	4m 55s
Unit Test (AWSPinpoint)	5m 5s
Unit Test (AWSPolly)	3m 52s
Unit Test (AWSRekognition)	7m 27s
Unit Test (AWSS3)	5m 35s
Unit Test (AWSSES)	3m 14s
Unit Test (AWSSNS)	3m 59s
Unit Test (AWSSQS)	4m 13s
Unit Test (AWSSageMakerRuntime)	3m 24s
Unit Test (AWSSimpleDB)	3m 38s
Unit Test (AWSTextract)	6m 49s
Unit Test (AWSTranscribe)	4m 49s
Unit Test (AWSTranscribeStreaming)	4m 0s
Unit Test (AWSTranslate)	3m 57s
Unit Test (AWSLocation)	4m 57s
Unit Test (AWSChimeSDKMessaging)	4m 46s
Unit Test (AWSChimeSDKIdentity)	4m 36s
	3h 7m 47s

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