Optimizations for EnhancedDocument.toJson() (#6446) #915

Job	Run time
check-s3-related-changes	53s
s3-regression-tests-download	1m 51s
s3-regression-tests-control-plane	1m 52s
s3-regression-tests-upload-sync	2m 21s
s3-regression-tests-upload-async	2m 21s
s3-regression-tests-upload-crt	2m 21s
s3-regression-tests-upload-multi	1m 52s
	13m 31s

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