Add expectContinueThresholdInBytes config to S3 #3348

Job	Run time
check-s3-related-changes	1m 7s
s3-regression-tests-upload-multi	6m 24s
s3-regression-tests-upload-async	22m 30s
s3-regression-tests-download	29m 58s
s3-regression-tests-upload-crt	8m 56s
s3-regression-tests-upload-sync	9m 25s
s3-regression-tests-control-plane	6m 40s
	1h 25m 0s

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