wip: refactor CSV bulk upload #6231

Job	Run time
run-tests / run-unit-tests	41s
run-build / ops-build	50s
run-linter / run-ts-linter	42s
run-tests / run-e2e-tests	4m 21s
run-build / lambda-build	46s
run-build / app-build	56s
run-tests / run-scenarios	3m 2s
run-tests / run-integration-tests	3m 16s
run-type-checking / run-python-type-checker	52s
run-tests / run-lambda-tests	36s
run-tests / run-ts-tests	45s
run-linter / run-python-linter	19s
	17m 6s

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