Make test more reliable #673

Job	Run time
check-s3-related-changes	53s
s3-regression-tests-download	4m 51s
s3-regression-tests-upload-multi	1m 51s
s3-regression-tests-control-plane	5m 27s
s3-regression-tests-upload-crt	3m 21s
s3-regression-tests-upload-async	3m 22s
s3-regression-tests-upload-sync	2m 21s
	22m 6s

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