wip: refactor CSV bulk upload #4718

Job	Run time
build-and-scan (refiner-app, Dockerfile.app)	1m 40s
build-and-scan (refiner-ops, Dockerfile.ops)	2m 22s
build-and-scan (refiner-lambda, Dockerfile.lambda)	1m 59s
scan-summary	13s
	6m 14s

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