fix(s3): cleanup file cache after mpu task is cancelled #564

Job	Run time
Unit Test (AWSAPIGateway)	3m 36s
Unit Test (AWSAutoScaling)	3m 45s
Unit Test (AWSCloudWatch)	5m 35s
Unit Test (AWSCognitoAuth)	3m 33s
Unit Test (AWSCognitoIdentityProvider)	3m 42s
Unit Test (AWSComprehend)	3m 27s
Unit Test (AWSConnect)	4m 0s
Unit Test (AWSConnectParticipant)	3m 8s
Unit Test (AWSCore)	4m 23s
Unit Test (AWSDynamoDB)	2m 12s
Unit Test (AWSEC2)	4m 15s
Unit Test (AWSElasticLoadBalancing)	3m 22s
Unit Test (AWSIoT)	3m 51s
Unit Test (AWSKMS)	2m 46s
Unit Test (AWSKinesis)	3m 25s
Unit Test (AWSKinesisVideo)	4m 30s
Unit Test (AWSKinesisVideoArchivedMedia)	3m 20s
Unit Test (AWSKinesisVideoSignaling)	4m 20s
Unit Test (AWSKinesisVideoWebRTCStorage)	3m 3s
Unit Test (AWSLambda)	3m 29s
Unit Test (AWSLex)	2m 33s
Unit Test (AWSLogs)	3m 0s
Unit Test (AWSMachineLearning)	2m 37s
Unit Test (AWSMobileClient)	4m 48s
Unit Test (AWSPinpoint)	3m 7s
Unit Test (AWSPolly)	3m 11s
Unit Test (AWSRekognition)	4m 1s
Unit Test (AWSS3)	3m 39s
Unit Test (AWSSES)	3m 25s
Unit Test (AWSSNS)	2m 55s
Unit Test (AWSSQS)	3m 19s
Unit Test (AWSSageMakerRuntime)	3m 2s
Unit Test (AWSSimpleDB)	6m 28s
Unit Test (AWSTextract)	3m 2s
Unit Test (AWSTranscribe)	3m 47s
Unit Test (AWSTranscribeStreaming)	3m 17s
Unit Test (AWSTranslate)	3m 43s
Unit Test (AWSLocation)	3m 26s
Unit Test (AWSChimeSDKMessaging)	3m 36s
Unit Test (AWSChimeSDKIdentity)	4m 14s
	2h 24m 52s

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