Add missing signer override tests #995

Job	Run time
check-s3-related-changes	2m 29s
s3-regression-tests-upload-sync	2m 51s
s3-regression-tests-upload-multi	2m 52s
s3-regression-tests-upload-crt	2m 50s
s3-regression-tests-control-plane	2m 51s
s3-regression-tests-download	3m 52s
s3-regression-tests-upload-async	2m 52s
	20m 37s

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